| kwbBaa | kwb | — | | | 6b · Threatened |
| bvjBaan | bvj | Niger–Congo | | | 6a · Vigorous |
| mbfBaba Malay | mbf | — | | 12,000 | 8a · Moribund |
| bbzBabalia Creole Arabic | bbz | Arabic-based pidgin and creole languages | | 3,900 | 8b · Nearly Extinct |
| bbkBabanki | bbk | Niger–Congo | | | 5 · Developing |
| baaBabatana | baa | Austronesian | | 7,070 | 5 · Developing |
| bcrBabine-Witsuwit'en | bcr | Na-Dene | | 175 | 7 · Shifting |
| bzgBabuza | bzg | Austronesian | | | 9 · Dormant |
| bafBaca | baf | Niger–Congo | | | 6b · Threatened |
| bcyBacama | bcy | Afroasiatic | | | 5 · Developing |
| btjBacanese Malaybahasa Batjan | btj | Austronesian | | 6 | 8b · Nearly Extinct |
| xbcBactrian | xbc | Indo-European | | | |
| bhzBadabahasa Bada' | bhz | Austronesian | | | 5 · Developing |
| bfqBadagaபடக பாஷை | bfq | Dravidian | | 134,000 | 5 · Developing |
| bdeBade | bde | Afroasiatic | | 250,000 | 6a · Vigorous |
| bdzBadeshi | bdz | Indo-European | | 3 | 9 · Dormant |
| biaBadimaya | bia | Australian Aboriginal languages | | | 8b · Nearly Extinct |
| jbiBadjiri | jbi | Australian Aboriginal languages | | | 10 · Extinct |
| bacBaduybasa Baduy | bac | — | | | 6a · Vigorous |
| pbpBadyara | pbp | Niger–Congo | | | 6a · Vigorous |
| bvdBaeggu | bvd | Austronesian | | | 6a · Vigorous |
| pkcBaekje | pkc | Koreanic | | | |
| bvcBaelelea | bvc | Austronesian | | | 6a · Vigorous |
| btrBaetora | btr | Austronesian | | | 6a · Vigorous |
| bwtBafaw-Balong | bwt | Niger–Congo | | | 6a · Vigorous |
| ksfBafia | ksf | Niger–Congo | | 60,000 | 6a · Vigorous |
| bgoBaga Koga | bgo | Niger–Congo | | | 8b · Nearly Extinct |
| bmdBaga Manduri | bmd | Niger–Congo | | | 6b · Threatened |
| bgmBaga Mboteni | bgm | Niger–Congo | | | Critically endangered |
| bspBaga Sitemu | bsp | Niger–Congo | | | 6a · Vigorous |
| bfyBagheli | bfy | Indo-European | | 8 m | 6a · Vigorous |
| bmiBagirmi | bmi | Nilo-Saharan | | 44,800 | 3 · Wider Communication |
| bgqBagri | bgq | Indo-European | | 1.9 m | 6a · Vigorous |
| bpiBagupi | bpi | — | | | 7 · Shifting |
| bqbBagusabahasa Bagusa | bqb | Tor-Kwerba | | | 6a · Vigorous |
| kvaBagvalal | kva | Northeast Caucasian | | 1,450 | 6b · Threatened |
| bdwBahambahasa Baham | bdw | — | | | 6b · Threatened |
| bahBahamian Creole | bah | — | | | 6a · Vigorous |
| bhvBahau | bhv | Austronesian | | | 6a · Vigorous |
| bjhBahinemo | bjh | — | | | 5 · Developing |
| bhjBahing | bhj | Sino-Tibetan | | | 6a · Vigorous |
| bdqBahnar | bdq | — | | 160,000 | 5 · Developing |
| bsuBahonsuaibahasa Bahonsuai | bsu | Austronesian | | | 7 · Shifting |
| abvBahrani Arabicلهجة بحرانية | abv | Afroasiatic | | | 3 · Wider Communication |
| bdjBai | bdj | Niger–Congo | | | 7 · Shifting |
| bbfBaibaibahasa Baibai | bbf | — | | | 6a · Vigorous |
| bkxBaikeno | bkx | Austronesian | | | 6a · Vigorous |
| bqhBaima | bqh | — | | | 6b · Threatened |
| bczBainouk-Gunyaamolo | bcz | Niger–Congo | | | 6b · Threatened |
| babBainouk-Gunyuño | bab | Niger–Congo | | | 6a · Vigorous |
| bcbBainouk-Samik | bcb | Niger–Congo | | | 6b · Threatened |
| bswBaiso | bsw | Afroasiatic | | 5,480 | 6a · Vigorous |
| fahBaissa Fali | fah | Niger–Congo | | | 10 · Extinct |
| bjmBajelani | bjm | Indo-European | | | 7 · Shifting |
| bdlBajo | bdl | Austronesian | | | 6a · Vigorous |
| bdhBaka | bdh | Nilo-Saharan | | | 5 · Developing |
| bkcBaka | bkc | Niger–Congo | | | 6a · Vigorous |
| bkqBakairi | bkq | — | | 950 | 5 · Developing |
| bqzBakaka | bqz | Niger–Congo | | | 6b · Threatened |
| beiBakati’ | bei | Austronesian | | | 6b · Threatened |
| bqiBakhtiariزون بَختیاری | bqi | Indo-European | | 1 m | 6a · Vigorous |
| bkiBaki | bki | Austronesian | | | 6b · Threatened |
| kmeBakole | kme | Niger–Congo | | | 8b · Nearly Extinct |
| bbsBakpinka | bbs | Niger–Congo | | | 9 · Dormant |
| bkrBakumpai | bkr | — | | | 3 · Wider Communication |
| bjwBakwé | bjw | — | | | 6a · Vigorous |
| blsBalaesangbahasa Balaisang | bls | — | | 3,200 | 7 · Shifting |
| sseBalangingih Sama | sse | Austronesian | | | 5 · Developing |
| blzBalantakbahasa Balantak | blz | — | | 30,000 | 5 · Developing |
| blgBalau | blg | Austronesian | | | 6b · Threatened |
| bdnBaldemu | bdn | Afroasiatic | | 4 | 10 · Extinct |
| koeBaleesi | koe | Nilo-Saharan | | | 6a · Vigorous |
| banBalineseBasa Bali | ban | Austronesian | | 4 m | 5 · Developing |
| mhpBalinese Malaybahasa Melayu Bali | mhp | — | | 25,000 | 6b · Threatened |
| bgxBalkan Gagauz Turkish | bgx | Turkic | | 464,000 | 7 · Shifting |
| rmnBalkan Romani | rmn | Indo-European | | 563,670 | 5 · Developing |
| balBalochiبلوچی | bal | Indo-European | | 82,767 | |
| bftBaltiསྦལ་ཏི། | bft | Ladakhi–Balti | | 290,000 | 5 · Developing |
| rmlBaltic Romani | rml | Indo-European | +4 | 50,000 | 5 · Developing |
| blqBaluan-Pam | blq | Austronesian | | | 6a · Vigorous |
| bogBamako Sign Language | bog | — | | | 6a · Vigorous |
| bbqBamali | bbq | — | | | 5 · Developing |
| ptuBambam | ptu | — | | | 5 · Developing |
| bamBambaraBamanankan | bam | Niger–Congo | | 4.2 m | 4 · Educational |
| myfBambassi | myf | Mao | | | 5 · Developing |
| bkaBambukae | bka | Niger–Congo | | | 6a · Vigorous |
| bceBamenyam | bce | Niger–Congo | | | 6a · Vigorous |
| bcfBamu | bcf | Kiwaian | | | 5 · Developing |
| baxBamumShüpamom | bax | Niger–Congo | | | 3 · Wider Communication |
| bmgBamwe | bmg | Niger–Congo | | | 6a · Vigorous |
| bfkBan Khor Sign Language | bfk | — | | | 6a · Vigorous |
| bcwBana | bcw | Afroasiatic | | 23,000 | 5 · Developing |
| bnhBanawá | bnh | Arawan | | 207 | |
| bndBanda | bnd | Austronesian | | 2,486 | 7 · Shifting |
| bpqBanda Malaybahasa Melayu Banda | bpq | — | | | 6a · Vigorous |
| bflBanda-Ndele | bfl | Niger–Congo | | | 6a · Vigorous |
| bzaBandi | bza | Niger–Congo | | | 5 · Developing |
| bqjBandial | bqj | Niger–Congo | | | 5 · Developing |
| bdyBandjalang | bdy | Australian Aboriginal languages | | | 8a · Moribund |
| bxgBangala | bxg | Niger–Congo | | | 3 · Wider Communication |
| bgfBangandu | bgf | Niger–Congo | | | 6a · Vigorous |
| bbeBangba | bbe | — | | | 6a · Vigorous |
| bniBangi | bni | Niger–Congo | | | 6a · Vigorous |
| dbaBangime | dba | — | | 3,500 | 6a · Vigorous |
| mfbBangkabahasa Bangka | mfb | — | | | 6a · Vigorous |
| benBanglaবাংলা | ben | Indo-European | | 106 m | 1 · National |
| bbmBango | bbm | Niger–Congo | | | 6b · Threatened |
| bgjBangolan | bgj | Niger–Congo | | 14,000 | 5 · Developing |
| bnxBangubangu | bnx | Niger–Congo | | | 6a · Vigorous |
| bsjBangwinji | bsj | — | | 6,000 | 5 · Developing |
| bwiBaniwa | bwi | Upper Amazon Arawakan | | | 8a · Moribund |
| bjnBanjarbahasa Banjar | bjn | Austronesian | | 3.5 m | 3 · Wider Communication |
| bxwBanka | bxw | Niger–Congo | | | 6a · Vigorous |
| jjrBankal | jjr | Niger–Congo | | 75,000 | 6a · Vigorous |
| dbwBankan Tey Dogon | dbw | Niger–Congo | | | 6a · Vigorous |
| abbBankon | abb | Niger–Congo | | | 6b · Threatened |
| bzyBanliku | bzy | Niger–Congo | | 65,000 | 6a · Vigorous |
| bcmBannoni | bcm | Austronesian | | | 6a · Vigorous |
| bapBantawa | bap | Sino-Tibetan | | | 6b · Threatened |
| bnqBantikbahasa Bantik | bnq | Austronesian | | | 8a · Moribund |
| bnoBantonese | bno | Austronesian | | 150,000 | 5 · Developing |
| bciBaoulé | bci | Niger–Congo | | 2.1 m | 5 · Developing |
| bhrBara Malagasy | bhr | Austronesian | | | 6a · Vigorous |
| rbpBarababaraba | rbp | Australian Aboriginal languages | | | 10 · Extinct |
| bbbBarai | bbb | Trans–New Guinea | | | 5 · Developing |
| bajBarakaibahasa Barakai | baj | Austronesian | | 4,450 | 6a · Vigorous |
| brdBaram | brd | Sino-Tibetan | | 50 | 8a · Moribund |
| kysBaram Kayan | kys | Austronesian | | | 6b · Threatened |
| bbgBarama | bbg | Niger–Congo | | | 6b · Threatened |
| brmBarambu | brm | Niger–Congo | | | 6a · Vigorous |
| bmzBaramu | bmz | Trans–New Guinea | | | 6a · Vigorous |
| brsBarasbahasa Baras | brs | Austronesian | | | 8a · Moribund |
| bsnBarasana-EduriaJãnerã - Eduria Oca | bsn | Tucanoan | | 1,900 | 5 · Developing |
| boiBarbareño | boi | Chumashan | | | 9 · Reawakening |
| bcjBardi | bcj | Nyulnyulan | | | 8a · Moribund |
| baeBaré | bae | Upper Amazon Arawakan | | 240 | 8b · Nearly Extinct |
| mlpBargam | mlp | — | | | 6b · Threatened |
| motBarí | mot | Chibchan | | | 6a · Vigorous |
| bfaBari | bfa | Nilo-Saharan | | 480,000 | 3 · Wider Communication |
| bchBariai | bch | Austronesian | | | 5 · Developing |
| bbaBariba | bba | Niger–Congo | | | 3 · Wider Communication |
| bxoBarikanchi Pidgin | bxo | — | | | 9 · Second language only |
| jbkBarikewa | jbk | — | | | 6a · Vigorous |
| maeBarkul | mae | Niger–Congo | | | 6b · Threatened |
| bjbBarngarla | bjb | Australian Aboriginal languages | | | 9 · Dormant |
| bjkBarok | bjk | Austronesian | | | 4 · Educational |
| bptBarrow Point | bpt | Australian Aboriginal languages | | | 10 · Extinct |
| bjzBaruga | bjz | Trans–New Guinea | | | 5 · Developing |
| bwgBarwe | bwg | Niger–Congo | | | 6b · Threatened |
| bjfBarzani Jewish Neo-Aramaic | bjf | — | | | 8b · Nearly Extinct |
| bzwBasa-Benue | bzw | Niger–Congo | | | 5 · Developing |
| basBasaa | bas | Niger–Congo | | 230,000 | 5 · Developing |
| bdbBasap | bdb | Austronesian | | | 6b · Threatened |
| byqBasay | byq | Austronesian | | | 10 · Extinct |
| bsgBashkardi | bsg | Indo-European | | 7,030 | 7 · Shifting |
| bakBashkirбашҡортса | bak | Turkic | +1 | 1.2 m | 2 · Provincial |
| bstBasketo | bst | — | | 92,600 | 4 · Educational |
| eusBasqueEuskara | eus | Paleo-European languages | | 750,000 | 2 · Provincial |
| bsqBassa | bsq | Niger–Congo | | 420,000 | 5 · Developing |
| bscBassari | bsc | Niger–Congo | | 33,600 | 5 · Developing |
| btaBata | bta | Afroasiatic | | | 6a · Vigorous |
| btqBatek | btq | Austroasiatic | | | 6b · Threatened |
| btvBateri | btv | — | | | 6a · Vigorous |
| bhmBathari | bhm | Afroasiatic | | | 8b · Nearly Extinct |
| btcBati | btc | Niger–Congo | | | 6a · Vigorous |
| bvtBatibahasa Bati | bvt | Austronesian | | | 6b · Threatened |
| bblBats | bbl | Northeast Caucasian | | 3,420 | 7 · Shifting |
| btuBatu | btu | — | | | 6a · Vigorous |
| zbtBatuibahasa Baha | zbt | Austronesian | | | 7 · Shifting |
| bayBatuleybahasa Batuley | bay | Austronesian | | | 6b · Threatened |
| bsfBauchi | bsf | — | | | 6a · Vigorous |
| bdcBaudoÊbêrâ 'Βe'dea | bdc | Choco | | 5,000 | 6b · Threatened |
| bpeBauni | bpe | Skou | | | Severely endangered |
| brgBaure | brg | — | | | 8a · Moribund |
| bxaBauro | bxa | Austronesian | | | 5 · Developing |
| bwkBauwaki | bwk | Trans–New Guinea | | | 6a · Vigorous |
| barBavarianBoarisch | bar | Indo-European | | 14.1 m | 5 · Developing |
| bgrBawm | bgr | Sino-Tibetan | | | 6b · Threatened |
| bjyBayali | bjy | Australian Aboriginal languages | | | 10 · Extinct |
| bvyBaybay | bvy | Austronesian | | | 6a · Vigorous |
| bylBayonobahasa Bayono | byl | — | | | 6b · Threatened |
| bdaBayot | bda | Niger–Congo | | | 6a · Vigorous |
| bxjBayungu | bxj | Australian Aboriginal languages | | | 9 · Dormant |
| beoBeami | beo | Bosavi | | | 5 · Developing |
| bzvBebe | bzv | Niger–Congo | | | 5 · Developing |
| bebBebele | beb | Niger–Congo | | | 6b · Threatened |
| bekBebeli | bek | Austronesian | | | 6b · Threatened |
| bxpBebil | bxp | Niger–Congo | | | 6a · Vigorous |
| avlBedawi Arabic | avl | Afroasiatic | +2 | | 6a · Vigorous |
| tnrBedik | tnr | Niger–Congo | | | 5 · Developing |
| bedBedoanasbahasa Bedoanas | bed | Austronesian | | | 7 · Shifting |
| bkfBeeke | bkf | Niger–Congo | | | 8a · Moribund |
| beqBeembe | beq | Niger–Congo | | | 5 · Developing |
| bnzBeezen | bnz | Niger–Congo | | | 6b · Threatened |
| ebcBegincibahasa Beginci | ebc | — | | | |
| bygBeigo | byg | Nilo-Saharan | | | 9 · Dormant |
| bejBeja | bej | Afroasiatic | | 1.2 m | 5 · Developing |
| bkvBekwarra | bkv | Niger–Congo | | | 6a · Vigorous |
| bkwBekwil | bkw | Niger–Congo | | | 6a · Vigorous |
| begBelait | beg | Austronesian | | | 7 · Shifting |
| bxbBelanda Bor | bxb | Nilo-Saharan | | | 5 · Developing |
| bviBelanda Viri | bvi | Niger–Congo | | | 5 · Developing |
| belBelarusianбеларуская мова | bel | Indo-European | +5 | 7.9 m | 1 · National |
| bywBelhare | byw | Sino-Tibetan | | | 6b · Threatened |
| beyBeli | bey | Torricelli | | | 6a · Vigorous |
| blmBeli | blm | Nilo-Saharan | | | 5 · Developing |
| bzjBelizean Creole | bzj | — | | 110,000 | 3 · Wider Communication |
| brwBellari | brw | Dravidian | | | 7 · Shifting |
| glbBelnəng | glb | Afroasiatic | | | |
| bemBemba | bem | Niger–Congo | | 3.6 m | 2 · Provincial |
| bmbBembe | bmb | Niger–Congo | | | 5 · Developing |
| bezBena | bez | Niger–Congo | | | 5 · Developing |
| yunBena | yun | — | | | 6a · Vigorous |
| bcqBench | bcq | Afroasiatic | | 347,000 | 4 · Educational |
| bdpBende | bdp | Niger–Congo | | 27,000 | 6a · Vigorous |
| bngBenga | bng | Niger–Congo | | | 6b · Threatened |
| bgyBenggoibahasa Benggoi | bgy | Austronesian | | | 8a · Moribund |
| bkeBengkulubahasa Bengkulu | bke | Austronesian | | | |
| bnuBentongbahasa Bentong | bnu | Austronesian | | | 6b · Threatened |
| bueBeothuk | bue | — | | | |
| bieBepour | bie | Trans–New Guinea | | | 6b · Threatened |
| bxvBeraku | bxv | Nilo-Saharan | | | 10 · Extinct |
| bveBeraubahasa Melayu Berau | bve | Austronesian | | | 6a · Vigorous |
| behBerba | beh | Niger–Congo | | | 5 · Developing |
| brcBerbice Creole Dutch | brc | Dutch-based creole languages | | | 10 · Extinct |
| bklBerikbahasa Sewan Teteris | bkl | Orya–Tor | | | 6b · Threatened |
| bitBerinomo | bit | Sepik | | | 6b · Threatened |
| bomBerom | bom | Niger–Congo | | | 5 · Developing |
| wtiBerta | wti | Nilo-Saharan | | 367,000 | 4 · Educational |
| bytBerti | byt | — | | | 10 · Extinct |
| besBesme | bes | Niger–Congo | | | 6a · Vigorous |
| bepBesoabahasa Behoa | bep | Austronesian | | | 6b · Threatened |
| bfeBetafbahasa Betaf | bfe | Orya–Tor | | | 6b · Threatened |
| bewBetawibasa Betawi | bew | Austronesian | | 5 m | 6b · Threatened |
| byfBete | byf | Niger–Congo | | | 8b · Nearly Extinct |
| bttBete-Bendi | btt | Niger–Congo | | | 5 · Developing |
| xubBetta Kurumba | xub | Dravidian | | | 5 · Developing |
| kapBezhta | kap | Northeast Caucasian | | 6,000 | 5 · Developing |
| bhdBhadrawahi | bhd | — | | | 6a · Vigorous |
| bhaBhariatiभरीयाटी | bha | Indo-European | | 50,000 | 6a · Vigorous |
| bhtBhatealiभटियाली | bht | Indo-European | | | 6a · Vigorous |
| bgwBhatri | bgw | Indo-European | | | 3 · Wider Communication |
| bheBhaya | bhe | Indo-European | | | 6b · Threatened |
| bhiBhilali | bhi | Indo-European | | | 6a · Vigorous |
| bhbBhili | bhb | Indo-European | | 3.3 m | 5 · Developing |
| bhoBhojpuriभोजपुरी भाषा | bho | Indo-European | | 52.2 m | 4 · Educational |
| byhBhujel | byh | Sino-Tibetan | | 3,900 | 8a · Moribund |
| bifBiafada | bif | Niger–Congo | | | 6a · Vigorous |
| bdfBiage | bdf | Trans–New Guinea | | | 6a · Vigorous |
| bhwBiak | bhw | Austronesian | | | 6b · Threatened |
| bigBiangai | big | Binanderean–Goilalan | | | 5 · Developing |
| bykBiao | byk | — | | 80,000 | 6a · Vigorous |
| bjeBiao Min | bje | Hmong–Mien | | | 6a · Vigorous |
| bmtBiao Mon | bmt | Hmong–Mien | | | 6b · Threatened |
| bthBiatahbahasa Biatah | bth | Austronesian | | | 6b · Threatened |
| xbpBibbulman | xbp | Australian Aboriginal languages | | | 10 · Extinct |
| hboBiblical Hebrewעִבְרִית מִקְרָאִית | hbo | Afroasiatic | | | 9 · Dormant |
| tvyBidau Creole Portuguese | tvy | — | | | 10 · Extinct |
| bidBidiyo | bid | Afroasiatic | | | 6a · Vigorous |
| bymBidyara | bym | — | | | 10 · Extinct |
| bmcBiem | bmc | Austronesian | | | 6a · Vigorous |
| bnkBierebo | bnk | Austronesian | | | 6b · Threatened |
| brjBieria | brj | Austronesian | | | 7 · Shifting |
| biuBiete | biu | Sino-Tibetan | | | 5 · Developing |
| nmbBig Nambas | nmb | Austronesian | | | 5 · Developing |
| bhcBigabahasa Biga | bhc | Austronesian | | | 6b · Threatened |
| xbeBigambal | xbe | Australian Aboriginal languages | | | 10 · Extinct |
| bjgBijago | bjg | Niger–Congo | | | 6a · Vigorous |
| bicBikaru | bic | — | | | 8a · Moribund |
| bikBikol | bik | Austronesian | | 2.5 m | |
| bybBikya | byb | Niger–Congo | | | 10 · Extinct |
| bipBila | bip | Niger–Congo | | | 6a · Vigorous |
| kfsBilaspuri | kfs | — | | | 6a · Vigorous |
| bpzBilbabahasa Bilba | bpz | — | | | 6a · Vigorous |
| blbBilua | blb | — | | | 5 · Developing |
| bxfBilur | bxf | Austronesian | | | 6a · Vigorous |
| bhpBimabahasa Bima | bhp | Austronesian | | | 6a · Vigorous |
| bhlBimin | bhl | Trans–New Guinea | | | 4 · Educational |
| bimBimoba | bim | Niger–Congo | | | 6b · Threatened |
| bmnBina | bmn | Austronesian | | | 10 · Extinct |
| bxzBinahari | bxz | Trans–New Guinea | | | 6a · Vigorous |
| xbdBindal | xbd | Australian Aboriginal languages | | | 10 · Extinct |
| bpjBinji | bpj | Niger–Congo | | | 6a · Vigorous |
| bneBintauna | bne | Austronesian | | 12,000 | 6b · Threatened |
| bnyBintulu | bny | Austronesian | | | 6b · Threatened |
| bkdBinukid | bkd | — | | 168,234 | 5 · Developing |
| lizBinza | liz | — | | | 6a · Vigorous |
| biqBipi | biq | Austronesian | | | 6a · Vigorous |
| bgvBipimbahasa Bipim | bgv | — | | | 6b · Threatened |
| brfBira | brf | Niger–Congo | | | 6b · Threatened |
| brrBirao | brr | Austronesian | | | 6a · Vigorous |
| brkBirgid | brk | Nilo-Saharan | | | 10 · Extinct |
| btfBirgit | btf | Afroasiatic | | | 6a · Vigorous |
| biyBirhor | biy | Austroasiatic | | | 6a · Vigorous |
| bzrBiri | bzr | Australian Aboriginal languages | | | 9 · Dormant |
| bqqBiritaibahasa Biri | bqq | Lakes Plain | | | 6b · Threatened |
| bixBirjia | bix | Austroasiatic | | | 6a · Vigorous |
| bvqBirri | bvq | Nilo-Saharan | | | 8a · Moribund |
| xbjBirrpayi | xbj | Australian Aboriginal languages | | | 10 · Extinct |
| brlBirwa | brl | Niger–Congo | | | 6a · Vigorous |
| ijeBiseni | ije | Niger–Congo | | | 6a · Vigorous |
| bpyBishnupriya Manipuriবিষ্ণুপ্রিয়া মণিপুরী | bpy | Indo-European | | 117,500 | 4 · Educational |
| bwhBishuo | bwh | Niger–Congo | | | 10 · Extinct |
| bnwBisis | bnw | Sepik | | | 5 · Developing |
| bisBislama | bis | — | | 10,000 | 1 · National |
| birBisorio | bir | Trans–New Guinea | | | 6b · Threatened |
| bibBissa | bib | Niger–Congo | | | 5 · Developing |
| bziBisu | bzi | Sino-Tibetan | | | 6a · Vigorous |
| bgkBit | bgk | Austroasiatic | | | 6a · Vigorous |
| brtBitare | brt | Niger–Congo | | | 6a · Vigorous |
| bwmBiwat | bwm | Yuat | | | 6a · Vigorous |
| gsoBiyanda-Buli | gso | Niger–Congo | | | 5 · Developing |
| blpBlablanga | blp | Austronesian | | | 6b · Threatened |
| blaBlackfootᓱᖽᐧᖿ | bla | Algic | | 5,000 | 7 · Shifting |
| beuBlagarbahasa Blagar | beu | Trans–New Guinea | | 10,000 | 6a · Vigorous |
| blrBlang | blr | Austroasiatic | | | 6a · Vigorous |
| bynBlin | byn | Afroasiatic | | 70,000 | 5 · Developing |
| zblBlissymbols | zbl | — | | | |
| bpwBo | bpw | Left May | | | 6b · Threatened |
| bglBo | bgl | Austroasiatic | | | 6b · Threatened |
| muxBo-Ung | mux | Trans–New Guinea | | | 5 · Developing |
| bznBoanobahasa Boano | bzn | Austronesian | | | 6a · Vigorous |
| bzlBoano | bzl | Austronesian | | | 6b · Threatened |
| bgbBobongkobahasa Bobongko | bgb | Austronesian | | | 6b · Threatened |
| btyBobot | bty | — | | | 6b · Threatened |
| brxBodoबोडो | brx | Sino-Tibetan | | 603,000 | 5 · Developing |
| boyBodo | boy | Niger–Congo | | | 8b · Nearly Extinct |
| bdvBodo Parja | bdv | Indo-European | | | 5 · Developing |
| bffBofi | bff | Niger–Congo | | 23,500 | 6a · Vigorous |
| bvwBoga | bvw | Afroasiatic | | | 6a · Vigorous |
| bhnBohtan Neo-Aramaic | bhn | Afroasiatic | | | 7 · Shifting |
| bzfBoiken | bzf | Sepik | | | 5 · Developing |
| ybkBokha | ybk | Sino-Tibetan | | | 6b · Threatened |
| bkyBoki | bky | Niger–Congo | | | 6a · Vigorous |
| nobBokmålbokmål | nob | Indo-European | | 4 m | |
| bqcBoko | bqc | Niger–Congo | | | 5 · Developing |
| bdtBokoto | bdt | Niger–Congo | | | 6a · Vigorous |
| bnpBola | bnp | Austronesian | | | 5 · Developing |
| bldBolangobahasa Bolango | bld | — | | 23,000 | 6b · Threatened |
| bolBole | bol | Afroasiatic | | | 6a · Vigorous |
| smkBolinaoBinubulinaw | smk | Austronesian | | 51,000 | 6b · Threatened |
| bvlBolivian Sign Language | bvl | — | | | 6a · Vigorous |
| blvBolo | blv | Niger–Congo | | | 6a · Vigorous |
| bljBolonganbahasa Bolongan | blj | — | | | 6a · Vigorous |
| plyBolyu | ply | Austroasiatic | | | 8a · Moribund |
| bmfBom | bmf | Niger–Congo | | | 8b · Nearly Extinct |
| bohBoma | boh | Niger–Congo | | | 6a · Vigorous |
| bmlBomboli | bml | Niger–Congo | | | 6b · Threatened |
| zmxBomitaba | zmx | Niger–Congo | | | 6b · Threatened |
| bmqBomu | bmq | Niger–Congo | | | 5 · Developing |
| bmwBomwali | bmw | Niger–Congo | | | 6a · Vigorous |
| pehBonanམ་ནི་སྐད་ཅི | peh | Mongolic | | 10,000 | 6b · Threatened |
| bfwBonda | bfw | Austroasiatic | | 9,000 | 6b · Threatened |
| bouBondei | bou | Niger–Congo | | | 6b · Threatened |
| dbuBondum Dogon | dbu | Niger–Congo | | | 6a · Vigorous |
| bnaBonerate | bna | Austronesian | | | 6a · Vigorous |
| bnvBonerifbahasa Bonerif | bnv | — | | | 7 · Shifting |
| bdgBonggi | bdg | Austronesian | | | 6b · Threatened |
| bpgBonggobahasa Armopa | bpg | Austronesian | | | 8a · Moribund |
| buiBongili | bui | Niger–Congo | | | 5 · Developing |
| botBongo | bot | Nilo-Saharan | | | 6a · Vigorous |
| bpuBongu | bpu | — | | | 6a · Vigorous |
| bokBonjo | bok | Niger–Congo | | | 7 · Shifting |
| bvgBonkeng | bvg | — | | | 6b · Threatened |
| bopBonkiman | bop | Trans–New Guinea | | | 6b · Threatened |
| abrBonotwi | abr | Niger–Congo | | 3 m | 5 · Developing |
| bnlBoon | bnl | Afroasiatic | | | 8a · Moribund |
| bvfBoor | bvf | Afroasiatic | | | 6b · Threatened |
| boaBoraMeamuyna | boa | Bora–Witoto | | 2,400 | 7 · Shifting |
| gaxBorana | gax | Afroasiatic | | | 5 · Developing |
| xxbBoro | xxb | Niger–Congo | | | Extinct |
| borBororo | bor | Macro-Jê | | 1,400 | 6b · Threatened |
| brnBoruca | brn | Chibchan | | | 9 · Dormant |
| bwfBoselewa | bwf | Austronesian | | | 6b · Threatened |
| bqsBosmun | bqs | Ramu–Lower Sepik | | | 6b · Threatened |
| bosBosnianbosanski jezik | bos | — | +1 | 3.5 m | 1 · National |
| bphBotlikh | bph | Northeast Caucasian | | 210 | 6b · Threatened |
| sblBotolan | sbl | Austronesian | | | 5 · Developing |
| suoBouni | suo | Skou | | | |
| pccBouyei | pcc | Kra–Dai | | 2 m | 6a · Vigorous |
| bovBowili | bov | Niger–Congo | | | 5 · Developing |
| gbqBozom | gbq | Niger–Congo | | | 6a · Vigorous |
| aofBragat | aof | Torricelli | | | 6a · Vigorous |
| brhBrahuiبراہوئی | brh | Dravidian | +1 | 1.8 m | 5 · Developing |
| braBraj Bhasha | bra | Indo-European | | 44,000 | 5 · Developing |
| bzsBrazilian Sign Language | bzs | — | | 3 m | 5 · Developing |
| brqBreri | brq | Ramu–Lower Sepik | | | 6a · Vigorous |
| breBretonbrezhoneg | bre | Indo-European | | 107,000 | 7 · Shifting |
| bzdBribri | bzd | Chibchan | | | 6b · Threatened |
| bfiBritish Sign Language | bfi | — | | 77,000 | 5 · Developing |
| broBrokkat | bro | — | | | 6b · Threatened |
| sgtBrokpa | sgt | Southern Tibetic | | | 6b · Threatened |
| bkkBrokskat | bkk | — | | | 6b · Threatened |
| bplBroome Pearling Lugger Pidgin | bpl | — | | 45 | 9 · Second language only |
| bsbBrunei Bisaya | bsb | Austronesian | | | 5 · Developing |
| kxdBrunei Malay | kxd | Austronesian | | | 3 · Wider Communication |
| jidBu | jid | Niger–Congo | | | 6a · Vigorous |
| bwxBu-Nao | bwx | Hmong–Mien | | 390,000 | 6b · Threatened |
| bubBua | bub | — | | | 6a · Vigorous |
| cblBualkhaw Chin | cbl | — | | | 5 · Developing |