- Jaad-Badyara [bady1239][pbp]
- Jabal Razih [jaba1234][rzh]
- Jad [jadd1243][jda]
- Jadgali [jadg1238][jdg]
- Jah Hut [jahh1242][jah]
- Jahanka [jaha1245][jad]
- Jakalteko, Western [jaka1246][jai]
- Jakartan Sign Language [indo1291][inl]
- Jakattoe [jort1240][jrt]
- Jakun [jaku1244][jak]
- Jalaa [cent2045][cet]
- Jalapa De Díaz Mazatec [jala1237][maj]
- Jalking [saka1296]
- Jalkunan [jalk1242][bxl]
- Jamaican Country Sign Language [jama1256][jcs]
- Jamaican Creole English [jama1262][jam]
- Jamaican Sign Language [jama1263][jls]
- Jambi Malay [jamb1236][jax]
- Jamiltepec Mixtec [jami1235][mxt]
- Jaminjung-Ngaliwurru [djam1255][djd]
- Jamsay Dogon [jams1239][djm]
- Jamtska [jamt1238]
- Jan-Awei [jana1236]
- Jandavra [jand1246][jnd]
- Jangkang [jang1257][djo]
- Jangshung [jang1254][jna]
- Janji [janj1240][jni]
- Japanese Sign Language [japa1238][jsl]
- Japanese [nucl1643][jpn]
- Japhug [japh1234]
- Japrería [japr1238][jru]
- Jaqaru [jaqa1244][jqr]
- Jara [jara1274][jaf]
- Jarai [jara1266][jra]
- Jarawa (India) [jara1245][anq]
- Jarawa (Nigeria) [jara1263][jar]
- Jargon Loucheux [jarg1234]
- Jaru [jaru1254][ddj]
- Jaruára [jaru1257][jap]
- Jauja Wanca Quechua [jauj1238][qxw]
- Jaunsari [jaun1243][jns]
- Javanese [java1254][jav]
- Javindo [javi1237][jvd]
- Jawe [jawe1237][jaz]
- Jawoyn [djau1244][djn]
- Jaya [jaya1242][jyy]
- Jebero [jebe1250][jeb]
- Jedek [jede1239]
- Jeh [jehh1245][jeh]
- Jehai [jeha1242][jhi]
- Jejara Naga [para1302][pzn]
- Jejueo [jeju1234][jje]
- Jeli [jeri1242][jek]
- Jenaama Bozo [jena1242][bze]
- Jenipapo-Kanindé [jeni1237]
- Jennu Kurumba [jenn1240][xuj]
- Jere [jere1244][jer]
- Jerung [jeru1240][jee]
- Jewish Babylonian Aramaic (ca. 200-1200 CE) [jewi1240][tmr]
- Jhyankot Sign Language [jhan1234][jhs]
- Jiamao [jiam1236][jio]
- Jiarong [jiar1242]
- Jiba [jiba1237][juo]
- Jibbali [sheh1240][shv]
- Jibu [jibu1239][jib]
- Jicarilla Apache [jica1244][apj]
- Jiiddu [jiid1238][jii]
- Jilbe [jilb1238][jie]
- Jimi (Cameroon) [jimi1254][jim]
- Jimi (Nigeria) [jimi1255][jmi]
- Jina [jina1244][jia]
- Jingulu [djin1251][jig]
- Jinyu Chinese [jiny1235][cjy]
- Jiongnai Bunu [jion1236][pnu]
- Jirajaran [jira1235]
- Jirel [jire1238][jul]
- Jirim [diri1253][dir]
- Jiru [jiru1238][jrr]
- Jita [jita1239][jit]
- Jitotolteco [jito1235]
- Jizhao [jizh1234]
- Jju [jjuu1238][kaj]
- Joba [joba1238][job]
- Joeka-Oajana Pidgin [joek1234]
- Jofotek-Bromnya [jofo1235][jbr]
- Jogi in the Sindh area [jogi1234][jog]
- Jola-Esulalu [jola1262][csk]
- Jola-Fonyi [jola1263][dyo]
- Jonkor Bourmataguil [jonk1238][jeu]
- Jordanian Bengali Pidgin Arabic [jord1239]
- Jorá [jora1240][jor]
- Jova [jova1234]
- Jowulu [jowu1238][jow]
- Ju [juuu1243][juu]
- Juang [juan1238][jun]
- Judeo-Berber [jude1262][jbe]
- Judeo-Hamadani-Borujerdi [jude1268]
- Judeo-Iraqi Arabic [jude1266][yhd]
- Judeo-Italian [jude1255][itk]
- Judeo-Moroccan Arabic [jude1265][aju]
- Judeo-Persian [jude1257][jpr]
- Judeo-Tat [jude1256][jdt]
- Judeo-Tripolitanian Arabic [jude1264][yud]
- Judeo-Yemeni Arabic [jude1267][jye]
- Jukun Takum [juku1254][jbu]
- Julud [julu1237]
- Jumana [juma1250]
- Jumano [juma1248]
- Jumjum [jumj1238][jum]
- Jumla Sign Language [juml1239][jus]
- Jumli [juml1238][jml]
- Juquila Mixe [juqu1238][mxq]
- Jur Modo [jurm1239][bex]
- Juray [jura1242][juy]
- Jurchen [jurc1239][juc]
- Juri [juri1235]
- Jurúna [juru1256][jur]
- Jutish [juti1236][jut]
- Juwal [juwa1238][mwb]
- Juxtlahuaca Mixtec [juxt1235][vmc]
- Jwira-Pepesa [jwir1241][jwi]
- Júma [juma1249][jua]