| gdmLaal | gdm | — | | 749 | 7 · Shifting |
| caeLaalaa | cae | Niger–Congo | | | 6a · Vigorous |
| bwjLaalaa Bwamu | bwj | Niger–Congo | | | 5 · Developing |
| ldiLaari | ldi | Niger–Congo | | | 5 · Developing |
| lbbLabel | lbb | Austronesian | | | 6a · Vigorous |
| jkuLabir | jku | Niger–Congo | | | 8a · Moribund |
| lbuLabu | lbu | Austronesian | | | 6b · Threatened |
| lacLacandon | lac | Central American Indian languages | | | 5 · Developing |
| lbtLachi | lbt | Kra–Dai | | | 6b · Threatened |
| zplLachixío Zapotec | zpl | Central American Indian languages | | | 5 · Developing |
| lbjLadakhi | lbj | — | | 14,952 | 5 · Developing |
| lldLadinladin | lld | Indo-European | | 30,000 | 6b · Threatened |
| lklLaeko | lkl | Torricelli | | | 6a · Vigorous |
| lafLafofa | laf | — | | | 6b · Threatened |
| lgbLaghu | lgb | Austronesian | | | 10 · Extinct |
| lghLaghuu | lgh | Sino-Tibetan | | | 6b · Threatened |
| kotLagwan | kot | Afroasiatic | | 10,000 | 6b · Threatened |
| lhaLaha | lha | Kra–Dai | | | 8a · Moribund |
| lhhLaha | lhh | Austronesian | | | 6a · Vigorous |
| kvtLahta | kvt | Sino-Tibetan | | 9,550 | 6a · Vigorous |
| lhuLahuLadhof | lhu | Sino-Tibetan | | 450,000 | 4 · Educational |
| lhiLahu Shi | lhi | Sino-Tibetan | | | 5 · Developing |
| ljiLaiyolo | lji | Austronesian | | | 6b · Threatened |
| lbeLakлакку | lbe | Northeast Caucasian | | 154,820 | 4 · Educational |
| lapLaka | lap | Nilo-Saharan | | | 5 · Developing |
| lkaLakalei | lka | Austronesian | | | 6b · Threatened |
| lmwLake Miwok | lmw | Yok-Utian | | | 9 · Dormant |
| lkhLakha | lkh | Southern Tibetic | | | 6b · Threatened |
| lkiLaki | lki | Indo-European | | 1.5 m | 6a · Vigorous |
| lbcLakkja | lbc | Kra–Dai | | 9,000 | 6a · Vigorous |
| lknLakon | lkn | Austronesian | | | 4 · Educational |
| lktLakotaLakȟótiyapi | lkt | Hoka-Sioux | | 2,000 | 8a · Moribund |
| dicLakota Dida | dic | Niger–Congo | | | 6a · Vigorous |
| nrzLala | nrz | Austronesian | | | 5 · Developing |
| lebLala-Bisa | leb | — | | 580,000 | 5 · Developing |
| cnlLalana Chinantec | cnl | Central American Indian languages | | | 5 · Developing |
| lasLama | las | Niger–Congo | | | 5 · Developing |
| layLama Bai | lay | Sino-Tibetan | | | 6a · Vigorous |
| slpLamaholotbahasa Lamaholot | slp | — | | 180,000 | 3 · Wider Communication |
| lmrLamalerabahasa Lamalera | lmr | — | | | 6a · Vigorous |
| hiaLamang | hia | Afroasiatic | | | 6a · Vigorous |
| qvsLamas Quechuallakwash runasimi | qvs | Quechua | | 15,000 | 6b · Threatened |
| lmqLamatukabahasa Lamatuka | lmq | Austronesian | | | 6a · Vigorous |
| lamLamba | lam | Niger–Congo | | 219,000 | 5 · Developing |
| lmnLambadi | lmn | — | | 6 m | 5 · Developing |
| qufLambayeque QuechuaInkawasi-Kañaris runashimi | quf | Quechua | | 20,000 | 5 · Developing |
| lmyLamboyabahasa Lamboya | lmy | Austronesian | | 25,000 | 6a · Vigorous |
| laiLambya | lai | Niger–Congo | | | 6a · Vigorous |
| lmuLamenu | lmu | Austronesian | | | 5 · Developing |
| lbnLamet | lbn | Austroasiatic | | | 6a · Vigorous |
| lmkLamkang | lmk | — | | | 5 · Developing |
| lmgLamogai | lmg | Austronesian | | | 5 · Developing |
| ljpLampung-AbungLappung | ljp | Austronesian | | | |
| ljpLampung Apibahasa Lampung Api | ljp | Austronesian | | | 6a · Vigorous |
| llhLamu | llh | Sino-Tibetan | | | 8a · Moribund |
| lbyLamu-Lamu | lby | Australian Aboriginal languages | | | 8b · Nearly Extinct |
| ruuLanas Lobu | ruu | Austronesian | | | 6b · Threatened |
| ldmLandoma | ldm | Niger–Congo | | 15,000 | 6a · Vigorous |
| lnmLangam | lnm | Mongol–Langam | | | 6b · Threatened |
| lgoLango | lgo | Nilo-Saharan | | | 6a · Vigorous |
| lajLango | laj | Nilo-Saharan | | 2.1 m | 5 · Developing |
| lncLanguedocianLengadocian | lnc | — | | 5,000 | Severely endangered |
| lnhLanoh | lnh | Austroasiatic | | | 6b · Threatened |
| laoLaoພາສາລາວ | lao | Kra–Dai | | 5.2 m | 1 · National |
| lwmLaomian | lwm | Sino-Tibetan | | | 6b · Threatened |
| lbgLaopan | lbg | Sino-Tibetan | | | 6a · Vigorous |
| lsoLaos Sign Language | lso | — | | | 6a · Vigorous |
| lraLaraʼbahasa Bakati'Rara | lra | Austronesian | | | 6a · Vigorous |
| lrgLaragiya | lrg | Australian Aboriginal languages | | 23 | 8b · Nearly Extinct |
| lrtLarantuka Malay | lrt | — | | 20,000 | 6b · Threatened |
| lbzLardil | lbz | Macro-Pama–Nyungan | | | 8b · Nearly Extinct |
| lrvLarevat | lrv | Austronesian | | | 6b · Threatened |
| lroLaro | lro | Niger–Congo | | | 5 · Developing |
| larLarteh | lar | Niger–Congo | | | 6a · Vigorous |
| lanLaru | lan | Niger–Congo | | | 6b · Threatened |
| lsaLasgerdi | lsa | Indo-European | | | 6a · Vigorous |
| lsiLashi | lsi | Sino-Tibetan | | 30,000 | 5 · Developing |
| lssLasi | lss | Sindhi languages | | | 6a · Vigorous |
| ltgLatgalianlatgaļu volūda | ltg | Indo-European | | 200,000 | 5 · Developing |
| latLatinLingua latina | lat | Indo-European | | 3,500 | 9 · Second language only |
| ltnLatundê | ltn | Nambikwaran | | 10 | 8a · Moribund |
| lavLatvianlatviešu valoda | lav | Indo-European | | 1.5 m | Safe |
| lslLatvian Sign Language | lsl | — | | 2,000 | 5 · Developing |
| lluLau | llu | Austronesian | | | 5 · Developing |
| lufLaua | luf | Trans–New Guinea | | | 10 · Extinct |
| llxLauan | llx | Austronesian | | | 6a · Vigorous |
| lawLaujebahasa Lauje | law | Austronesian | | | 6b · Threatened |
| lurLaurabahasa Laura | lur | Austronesian | | 10,000 | 6a · Vigorous |
| lbvLavatbura-Lamusong | lbv | Austronesian | | | 6a · Vigorous |
| brbLave | brb | Austroasiatic | | | 5 · Developing |
| lviLavi | lvi | Austroasiatic | | | 8a · Moribund |
| lvkLavukaleve | lvk | — | | 1,783 | 6a · Vigorous |
| lbxLawangan | lbx | Austronesian | | | 6a · Vigorous |
| lwuLawu | lwu | Sino-Tibetan | | | 8b · Nearly Extinct |
| tgiLawunuia | tgi | Austronesian | | | 6a · Vigorous |
| lxmLaxudumau | lxm | Austronesian | | | Vulnerable |
| lzzLazლაზური | lzz | — | | 250,000 | 6b · Threatened |
| rejLebongbahasa Rejang | rej | Austronesian | | | |
| lecLeco | lec | — | | | 8b · Nearly Extinct |
| lljLedji-Ledji | llj | Australian Aboriginal languages | | | 9 · Dormant |
| lewLedo Kailibahasa Kaili Ledo | lew | — | | | 3 · Wider Communication |
| leaLega-Shabunda | lea | Niger–Congo | | | 5 · Developing |
| lccLegenyembahasa Legenyem | lcc | Austronesian | | | 6a · Vigorous |
| tqlLehali | tql | Austronesian | | | 6b · Threatened |
| lekLeipon | lek | Austronesian | | | 6a · Vigorous |
| luhLeizhou Min | luh | Sino-Tibetan | | | |
| llkLelak | llk | Austronesian | | | 10 · Extinct |
| llnLele | lln | Afroasiatic | | | 5 · Developing |
| lleLele | lle | Austronesian | | | 5 · Developing |
| lelLele | lel | Niger–Congo | | 26,000 | 6a · Vigorous |
| llcLele | llc | Niger–Congo | | | 6a · Vigorous |
| lefLelemi | lef | Niger–Congo | | | 5 · Developing |
| lpaLelepa | lpa | Austronesian | | | 6a · Vigorous |
| lmtLematangbasè Lematang | lmt | Austronesian | | | |
| lrzLemerig | lrz | Austronesian | | | 8b · Nearly Extinct |
| leyLemolang | ley | Austronesian | | | 8a · Moribund |
| tnlLenakel | tnl | Austronesian | | | 5 · Developing |
| lenLencan | len | — | | | 9 · Dormant |
| ledLendu | led | Nilo-Saharan | | 26,000 | 5 · Developing |
| lgiLengilubahasa Lengilu | lgi | Austronesian | | | 9 · Dormant |
| lgrLengo | lgr | Austronesian | | | 6a · Vigorous |
| legLengua | leg | Mascoian | | | Severely endangered |
| bxcLengue | bxc | Niger–Congo | | | 6b · Threatened |
| lehLenje | leh | — | | 156,000 | 5 · Developing |
| lerLenkau | ler | Austronesian | | | 6a · Vigorous |
| lepLepcha | lep | Sino-Tibetan | | 66,500 | 6b · Threatened |
| lpeLepkibahasa Lepki | lpe | — | | | 6b · Threatened |
| xlpLepontic | xlp | Indo-European | | | |
| gnhLere | gnh | Niger–Congo | | | 9 · Dormant |
| lesLese | les | Nilo-Saharan | | | 6a · Vigorous |
| efeLese | efe | Nilo-Saharan | | | 6a · Vigorous |
| letLesing-Gelimi | let | Austronesian | | | 6a · Vigorous |
| nmsLetemboi | nms | Austronesian | | | 6b · Threatened |
| leoLeti | leo | Niger–Congo | | | 7 · Shifting |
| ltiLeti | lti | Austronesian | | | 7 · Shifting |
| apcLevantine Arabic | apc | Afroasiatic | +3 | 44 m | |
| lvuLevukabahasa Levuka | lvu | — | | | 6a · Vigorous |
| lwwLewo | lww | Austronesian | | | 5 · Developing |
| lweLewo Elengbahasa Lewo Eleng | lwe | — | | | 6a · Vigorous |
| lwtLewotobi | lwt | Austronesian | | 6,000 | 6a · Vigorous |
| lezLezgianЛезги чIал | lez | Northeast Caucasian | | 633,610 | 4 · Educational |
| lhpLhokpu | lhp | Sino-Tibetan | | | 6b · Threatened |
| lhmLhomi | lhm | — | | | 5 · Developing |
| ljlLi'obahasa Aku | ljl | — | | 105,000 | 6a · Vigorous |
| lixLiabukubahasa Liabuku | lix | Austronesian | | | 8a · Moribund |
| njnLiangmai Naga | njn | Sino-Tibetan | | | 4 · Educational |
| liqLibido | liq | — | | 64,000 | 4 · Educational |
| lblLibon Bikol | lbl | Austronesian | | | 6a · Vigorous |
| xliLiburnian | xli | Indo-European | | | |
| aylLibyan Arabic | ayl | Afroasiatic | | 4.3 m | 3 · Wider Communication |
| ligLigbi | lig | Niger–Congo | | | 6a · Vigorous |
| xlgLigurian | xlg | Indo-European | | | |
| lijLigurianLengoa ligure | lij | Indo-European | | 500,000 | 5 · Developing |
| likLika | lik | Niger–Congo | | | 5 · Developing |
| lioLikibahasa Liki | lio | Austronesian | | 11 | 8a · Moribund |
| lipLikpe | lip | Niger–Congo | | | 5 · Developing |
| libLikum | lib | Austronesian | | | 6b · Threatened |
| lllLilau | lll | Torricelli | | | 6b · Threatened |
| lilLillooet | lil | Salishan | | | 8a · Moribund |
| mzdLimba | mzd | Niger–Congo | | | 6b · Threatened |
| lifLimbu | lif | Sino-Tibetan | | 420,000 | 5 · Developing |
| lmpLimbum | lmp | Niger–Congo | | | 5 · Developing |
| limLimburgishLimburgs | lim | Indo-European | | 1.6 m | 2 · Provincial |
| lmcLimilngan | lmc | — | | | 10 · Extinct |
| kmkLimos Kalinga | kmk | Austronesian | | | 4 · Educational |
| lmsLimousinLemosin | lms | — | | 10,000 | Severely endangered |
| klwLindu | klw | — | | 2,400 | 5 · Developing |
| linLingalaLingála | lin | Niger–Congo | | 20 m | 3 · Wider Communication |
| lgkLingarak | lgk | Austronesian | | | 6b · Threatened |
| lnjLinngithigh | lnj | Australian Aboriginal languages | | | 10 · Extinct |
| aplLipan | apl | Na-Dene | | | 9 · Dormant |
| lpoLipo | lpo | Sino-Tibetan | | | 6a · Vigorous |
| lclLisela | lcl | Austronesian | | 11,900 | 7 · Shifting |
| lshLish | lsh | Sino-Tibetan | | | 6b · Threatened |
| trgLishán Didán | trg | — | | 4,378 | 8a · Moribund |
| lisLisuꓡꓲ-ꓢꓴ | lis | Sino-Tibetan | | | 3 · Wider Communication |
| litLithuanianLietuvių kalba | lit | Indo-European | | 4 m | 1 · National |
| llsLithuanian Sign Language | lls | — | | | 5 · Developing |
| lzlLitzlitz | lzl | Austronesian | | | 8b · Nearly Extinct |
| livLivonianlīvõ kēļ | liv | Uralic | | 1 | 9 · Dormant |
| oloLivvi-KarelianLivvinkarjala | olo | Uralic | | 30,770 | 5 · Developing |
| lhtLo-Toga | lht | Austronesian | | | 6b · Threatened |
| lrkLoarki | lrk | Indo-European | | | 6a · Vigorous |
| loqLobala | loq | Niger–Congo | | | 6a · Vigorous |
| lobLobi | lob | Niger–Congo | | 440,000 | 5 · Developing |
| lgqLogba | lgq | Niger–Congo | | | 6a · Vigorous |
| logLogo | log | Nilo-Saharan | | | 5 · Developing |
| lofLogol | lof | Niger–Congo | | | 8a · Moribund |
| ragLogooli | rag | Niger–Congo | | 618,300 | 4 · Educational |
| liuLogorik | liu | Nilo-Saharan | | | 6b · Threatened |
| srcLogudorese | src | Indo-European | | | 6b · Threatened |
| lbrLohorung | lbr | Sino-Tibetan | | | 6b · Threatened |
| bizLoi | biz | Niger–Congo | | | 6a · Vigorous |
| qvjLoja Highland Quichua | qvj | Quechua | | | 8a · Moribund |
| bktLoki | bkt | Niger–Congo | | | 6b · Threatened |
| yazLoko | yaz | Niger–Congo | | | 5 · Developing |
| lokLoko | lok | Niger–Congo | | | 5 · Developing |
| lkyLokoya | lky | Nilo-Saharan | | | 6b · Threatened |
| lcdLolabahasa Lola | lcd | Austronesian | | 900 | 6b · Threatened |
| llqLolakbahasa Lolak | llq | Austronesian | | | 8b · Nearly Extinct |
| llgLolebahasa Lole | llg | Austronesian | | | 6a · Vigorous |
| llbLolo | llb | Niger–Congo | | | 5 · Developing |
| loaLoloda | loa | West Papuan | | | 5 · Developing |
| yclLolopo | ycl | Sino-Tibetan | | | 6a · Vigorous |
| lomLoma | lom | Niger–Congo | | | 5 · Developing |
| lmvLomaiviti | lmv | Austronesian | | | 6a · Vigorous |
| rmiLomavren | rmi | Indo-European | | | 8a · Moribund |
| lmoLombardLengua lombarda | lmo | Indo-European | | 3.9 m | 6a · Vigorous |
| lngLombardic | lng | Indo-European | | | |
| looLombo | loo | Niger–Congo | | | 6a · Vigorous |
| nglLomwe | ngl | Niger–Congo | | | 5 · Developing |
| lceLoncongbahasa Loncong | lce | Austronesian | | | 6b · Threatened |
| bzmLondo | bzm | Niger–Congo | | | 6b · Threatened |
| lguLonggu | lgu | Austronesian | | | 6a · Vigorous |
| lnuLonguda | lnu | — | | | 6a · Vigorous |
| losLoniu | los | Austronesian | | | 6a · Vigorous |
| crcLonwolwol | crc | Austronesian | | | 5 · Developing |
| lovLopi | lov | Sino-Tibetan | | | 6a · Vigorous |
| lpxLopit | lpx | Nilo-Saharan | | | 6a · Vigorous |
| lseLosengo | lse | Niger–Congo | | | 6a · Vigorous |
| uvlLote | uvl | Austronesian | | | 5 · Developing |
| njhLotha | njh | Sino-Tibetan | | 179,467 | 5 · Developing |
| dtrLotud | dtr | Austronesian | | | 6b · Threatened |
| lotLotuko | lot | Nilo-Saharan | | 310,000 | 5 · Developing |
| lojLou | loj | Austronesian | | 1,000 | 6a · Vigorous |
| louLouisiana CreoleKouri-Vini | lou | French-based creole languages | | 10,000 | 8a · Moribund |
| loxLounbahasa Loun | lox | Austronesian | | | 10 · Extinct |
| vnkLovono | vnk | Austronesian | | | 8b · Nearly Extinct |
| ndsLow GermanPlattdütsch | nds | Indo-European | | 5 m | 7 · Shifting |
| loyLowaल्होवा | loy | — | | | 6a · Vigorous |
| axlLower Arrernte | axl | Australian Aboriginal languages | | | 9 · Dormant |
| xbbLower Burdekin | xbb | Australian Aboriginal languages | | | |
| ceaLower Chehalis | cea | Salishan | | | 9 · Dormant |
| chhLower Chinook | chh | — | | | 9 · Dormant |
| dniLower Grand Valley Dani | dni | Trans–New Guinea | | | 5 · Developing |
| nsbLower Nossob | nsb | Khoisan | | | Extinct |
| dsbLower Sorbiandolnoserbšćina | dsb | Indo-European | | 6,670 | 8a · Moribund |
| taaLower Tanana | taa | Na-Dene | | 15 | 8a · Moribund |
| tacLowland Tarahumara | tac | Uto-Aztecan | | | 5 · Developing |
| urrLöyöp | urr | Austronesian | | | 6a · Vigorous |
| lozLozi | loz | Niger–Congo | +2 | 600,000 | 4 · Educational |
| lexLuang | lex | Austronesian | | | 5 · Developing |
| luaLuba-KasaiTshiluba | lua | Niger–Congo | | 6.3 m | 2 · Provincial |
| lubLuba-KatangaKiluba | lub | Niger–Congo | | | 6b · Threatened |
| kccLubila | kcc | Niger–Congo | | | 6a · Vigorous |
| lcfLubu | lcf | — | | | 6a · Vigorous |
| knbLubuagan Kalinga | knb | Austronesian | | | 4 · Educational |
| lchLucazi | lch | Niger–Congo | | | 5 · Developing |
| luqLucumí | luq | Niger–Congo | | | 9 · Second language only |
| ludLudic | lud | Uralic | | 3,000 | 7 · Shifting |
| ldqLufu | ldq | Niger–Congo | | | 8a · Moribund |
| lugLuganda | lug | Niger–Congo | | 5.1 m | 3 · Wider Communication |
| lggLugbara | lgg | Nilo-Saharan | | | 5 · Developing |
| rufLuguru | ruf | Niger–Congo | | 692,000 | 6a · Vigorous |
| lcqLuhu | lcq | Austronesian | | | 6b · Threatened |
| luyLuhya | luy | Niger–Congo | | | |
| lumLuimbi | lum | Niger–Congo | | | 6a · Vigorous |
| luiLuiseño | lui | Uto-Aztecan | | | 9 · Dormant |
| lkbLukabaras | lkb | Niger–Congo | | | 5 · Developing |
| dopLukpa | dop | Niger–Congo | | 160,000 | 5 · Developing |
| smjLule Samijulevsámegiella | smj | Uralic | | 700 | 2 · Provincial |
| lupLumbu | lup | Niger–Congo | | | 6a · Vigorous |
| lmdLumun | lmd | Niger–Congo | | | 5 · Developing |
| lndLun Bawangbahasa Lun Bawang | lnd | Austronesian | | | 5 · Developing |
| lujLuna | luj | Niger–Congo | | | 6a · Vigorous |
| lunLunda | lun | Niger–Congo | | | 4 · Educational |
| vmgLungalunga | vmg | Austronesian | | | 6a · Vigorous |
| lgaLungga | lga | Austronesian | | | 5 · Developing |
| hmlLuopohe Miao | hml | Hmong–Mien | | | 6a · Vigorous |
| lddLuri | ldd | Afroasiatic | | | 10 · Extinct |
| lutLushootseed | lut | Salishan | | | 9 · Reawakening |
| khlLusi | khl | Austronesian | | | 6a · Vigorous |
| xlsLusitanian | xls | Indo-European | | | |
| ltsLutachoni | lts | Niger–Congo | | | 5 · Developing |
| ndyLutos | ndy | — | | | 6a · Vigorous |
| lueLuvale | lue | Niger–Congo | | | 2 · Provincial |
| luvLuwati | luv | Sindhi languages | | | 6a · Vigorous |
| lwoLuwo | lwo | — | | | 5 · Developing |
| ltzLuxembourgishLëtzebuergesch | ltz | — | +1 | 470,200 | 4 · Educational |
| lynLuyana | lyn | Niger–Congo | | | 4 · Educational |
| lwaLwalu | lwa | Niger–Congo | | | 6a · Vigorous |
| bgaLyase | bga | Niger–Congo | | | 8b · Nearly Extinct |
| xldLydian𐤮𐤱𐤠𐤭𐤣𐤶𐤯𐤦𐤳 | xld | Indo-European | | | |
| leeLyélé | lee | Niger–Congo | | | 6b · Threatened |