|- ! zaa | || || I/L || Zapotec || || Sierra de Juárez Zapotec |- ! zab | || || I/L || Zapotec || || San Juan Guelavía Zapotec; Western Tlacolula Valley Zapotec |- ! zac | || || I/L || Zapotec || || Ocotlán Zapotec |- ! zad | || || I/L || Zapotec || || Cajonos Zapotec |- ! zae | || || I/L || Zapotec || || Yareni Zapotec |- ! zaf | || || I/L || Zapotec || || Ayoquesco Zapotec |- ! zag | || || I/L || Nilo-Saharan || || Zaghawa |- ! zah | || || I/L || Niger–Congo || || Zangwal |- ! zai | || || I/L || Zapotec || Diidxazá' || Isthmus Zapotec |- ! zaj | || || I/L || Niger–Congo || || Zaramo |- ! zak | || || I/L || Niger–Congo || || Zanaki |- ! zal | || || I/L || Sino-Tibetan || Rouruo || Zauzou |- ! zam | || || I/L || Zapotec || || Miahuatlán Zapotec |- ! zao | || || I/L || Zapotec || || Ozolotepec Zapotec |- ! zap | || zap || M/L || Zapotec || || Zapotec |- ! zaq | || || I/L || Oto-Manguean || tizha' || Aloápam Zapotec |- ! zar | || || I/L || Zapotec || || Rincón Zapotec |- ! zas | || || I/L || Zapotec || || Santo Domingo Albarradas Zapotec |- ! zat | || || I/L || Zapotec || || Tabaa Zapotec |- ! zau | || || I/L || Sino-Tibetan || || Zangskari |- ! zav | || || I/L || Zapotec || || Yatzachi Zapotec |- ! zaw | || || I/L || Zapotec || || Mitla Zapotec |- ! zax | || || I/L || Zapotec || || Xadani Zapotec |- ! zay | || || I/L || Afro-Asiatic || || Zaysete; Zayse-Zergulla |- ! zaz | || || I/L || Afro-Asiatic || || Zari |- ! zba | || || I/C || constructed || || Balaibalan |- ! zbc | || || I/L || Austronesian || || Central Berawan |- ! zbe | || || I/L || Austronesian || || East Berawan |- ! zbl | || zbl || I/C || constructed || || Bliss; Blissymbolics; Blissymbols |- ! zbt | || || I/L || Austronesian || || Batui |- ! zbu | || || I/L || Afro-Asiatic || || Bu (Bauchi State) |- ! zbw | || || I/L || Austronesian || || West Berawan |- ! zca | || || I/L || Zapotec || || Coatecas Altas Zapotec |- ! zcd | || || I/L || Oto-Manguean || || Las Delicias Zapotec |- ! zch | || || I/L || Tai–Kadai || || Central Hongshuihe Zhuang |- ! zdj | || || I/L || Niger–Congo || || Ngazidja Comorian |- ! zea | || || I/L || Indo-European || || Zeeuws |- ! zeg | || || I/L || Austronesian || || Zenag |- ! zeh | || || I/L || Tai–Kadai || || Eastern Hongshuihe Zhuang |- ! zem | || || I/L || Afro-Asiatic || || Zeem |- ! zen | || zen || I/L || Afro-Asiatic || || Zenaga |- ! zga | || || I/L || Niger–Congo || || Kinga |- ! zgb | || || I/L || Tai–Kadai || || Guibei Zhuang |- ! zgh | || zgh || I/L || Afro-Asiatic || || Standard Moroccan Tamazight |- ! zgm | || || I/L || Tai–Kadai || || Minz Zhuang |- ! zgn | || || I/L || Tai–Kadai || || Guibian Zhuang |- ! zgr | || || I/L || Austronesian || || Magori |- ! zha | za || zha || M/L || Tai–Kadai || || Chuang; Zhuang |- ! zhb | || || I/L || Sino-Tibetan || || Zhaba |- ! zhd | || || I/L || Tai–Kadai || || Dai Zhuang |- ! zhi | || || I/L || Niger–Congo || || Zhire |- ! zhk | || || I/L || Deaf-community sign language (language isolate?) || || Kurdish Sign Language |- ! zhn | || || I/L || Tai–Kadai || || Nong Zhuang |- ! zho | zh || chi || M/L || Sino-Tibetan || 中文; 汉语/漢語; 华语/華語 || Chinese |- ! zhw | || || I/L || Niger–Congo || || Zhoa |- ! zia | || || I/L || Trans–New Guinea || || Zia |- ! zib | || || I/L || isolate || || Zimbabwe Sign Language |- ! zik | || || I/L || Trans–New Guinea || || Zimakani |- ! zil | || || I/L || Niger–Congo || || Zialo |- ! zim | || || I/L || Afro-Asiatic || || Mesme |- ! zin | || || I/L || Niger–Congo || || Zinza |- ! (zir) | || || I/E || Niger–Congo || || Ziriya |- ! ziw | || || I/L || Niger–Congo || || Zigula |- ! ziz | || || I/L || Afro-Asiatic || || Zizilivakan |- ! zka | || || I/L || Austronesian || || Kaimbulawa |- ! (zkb) | || || I/E || spurious language || || Koibal |- ! zkd | || || I/L || Sino-Tibetan || || Kadu |- ! zkg | || || I/H || Buyeo || || Koguryo |- ! zkh | || || I/H || Turkic || || Khorezmian |- ! zkk | || || I/E || unclassified || || Karankawa |- ! zkn | || || I/L || Sino-Tibetan || || Kanan |- ! zko | || || I/E || Dené–Yeniseian || || Kott |- ! zkp | || || I/E || Macro-Jê || || São Paulo Kaingáng |- ! zkr | || || I/L || Sino-Tibetan || || Zakhring |- ! zkt | || || I/H || Mongolic || || Kitan |- ! zku | || || I/L || Pama–Nyungan || || Kaurna |- ! zkv | || || I/E || Uralic || || Krevinian |- ! zkz | || || I/H || Turkic || || Khazar |- ! zla | || || I/L || Niger–Congo || || Zula |- ! zlj | || || I/L || Tai–Kadai || || Liujiang Zhuang |- ! zlm | || || I/L || Austronesian || || Malay (individual language) |- ! zln | || || I/L || Tai–Kadai || || Lianshan Zhuang |- ! zlq | || || I/L || Tai–Kadai || || Liuqian Zhuang |- ! zlu | || || I/L || Afro-Asiatic || || Zul |- ! zma | || || I/L || Western Daly || || Manda (Australia) |- ! zmb | || || I/L || Niger–Congo || || Zimba |- ! zmc | || || I/E || Pama–Nyungan || || Margany |- ! zmd | || || I/L || Western Daly || || Maridan |- ! zme | || || I/E || Arnhem Land || || Mangerr |- ! zmf | || || I/L || Niger–Congo || || Mfinu |- ! zmg | || || I/L || Western Daly || || Marti Ke |- ! zmh | || || I/E || unclassified || || Makolkol |- ! zmi | || || I/L || Austronesian || || Negeri Sembilan Malay |- ! zmj | || || I/L || Western Daly || || Maridjabin |- ! zmk | || || I/E || Pama–Nyungan || || Mandandanyi |- ! zml | || || I/E || Eastern Daly || || Matngala |- ! zmm | || || I/L || Western Daly || || Marimanindji; Marramaninyshi |- ! zmn | || || I/L || Niger–Congo || || Mbangwe |- ! zmo | || || I/L || Nilo-Saharan || || Molo |- ! zmp | || || I/L || Niger–Congo? || Mpuun || Mbuun |- ! zmq | || || I/L || Niger–Congo || || Mituku |- ! zmr | || || I/L || Western Daly || || Maranunggu |- ! zms | || || I/L || Niger–Congo || || Mbesa |- ! zmt | || || I/L || Western Daly || || Maringarr |- ! zmu | || || I/E || Pama–Nyungan || || Muruwari |- ! zmv | || || I/E || Pama–Nyungan || || Mbariman-Gudhinma |- ! zmw | || || I/L || Niger–Congo || || Mbo (Democratic Republic of Congo) |- ! zmx | || || I/L || Niger–Congo || || Bomitaba |- ! zmy | || || I/L || Western Daly || || Mariyedi |- ! zmz | || || I/L || Ubangian || || Mbandja |- ! zna | || || I/L || Niger–Congo || || Zan Gula |- ! zne | || || I/L || Niger–Congo || || Zande (individual language) |- ! zng | || || I/L || Austroasiatic || || Mang |- ! znk | || || I/E || Iwaidjan || || Manangkari |- ! zns | || || I/L || Afro-Asiatic || || Mangas |- ! zoc | || || I/L || Mixe-Zoquean || || Copainalá Zoque |- ! zoh | || || I/L || Mixe-Zoquean || || Chimalapa Zoque |- ! zom | || || I/L || Sino-Tibetan || Zo || Zou |- ! zoo | || || I/L || Zapotec || || Asunción Mixtepec Zapotec |- ! zoq | || || I/L || Mixe-Zoquean || || Tabasco Zoque |- ! zor | || || I/L || Mixe-Zoquean || || Rayón Zoque |- ! zos | || || I/L || Mixe-Zoquean || || Francisco León Zoque |- ! zpa | || || I/L || Zapotec || || Lachiguiri Zapotec |- ! zpb | || || I/L || Zapotec || || Yautepec Zapotec |- ! zpc | || || I/L || Zapotec || || Choapan Zapotec |- ! zpd | || || I/L || Zapotec || || Southeastern Ixtlán Zapotec |- ! zpe | || || I/L || Zapotec || || Petapa Zapotec |- ! zpf | || || I/L || Zapotec || || San Pedro Quiatoni Zapotec |- ! zpg | || || I/L || Oto-Manguean || || Guevea De Humboldt Zapotec |- ! zph | || || I/L || Zapotec || || Totomachapan Zapotec |- ! zpi | || || I/L || Zapotec || || Santa María Quiegolani Zapotec |- ! zpj | || || I/L || Zapotec || || Quiavicuzas Zapotec |- ! zpk | || || I/L || Zapotec || || Tlacolulita Zapotec |- ! zpl | || || I/L || Zapotec || || Lachixío Zapotec |- ! zpm | || || I/L || Zapotec || || Mixtepec Zapotec |- ! zpn | || || I/L || Zapotec || || Santa Inés Yatzechi Zapotec |- ! zpo | || || I/L || Zapotec || || Amatlán Zapotec |- ! zpp | || || I/L || Zapotec || || El Alto Zapotec |- ! zpq | || || I/L || Zapotec || || Zoogocho Zapotec |- ! zpr | || || I/L || Zapotec || || Santiago Xanica Zapotec |- ! zps | || || I/L || Zapotec || || Coatlán Zapotec |- ! zpt | || || I/L || Zapotec || || San Vicente Coatlán Zapotec |- ! zpu | || || I/L || Zapotec || || Yalálag Zapotec |- ! zpv | || || I/L || Zapotec || || Chichicapan Zapotec |- ! zpw | || || I/L || Zapotec || || Zaniza Zapotec |- ! zpx | || || I/L || Zapotec || || San Baltazar Loxicha Zapotec |- ! zpy | || || I/L || Zapotec || || Mazaltepec Zapotec |- ! zpz | || || I/L || Zapotec || || Texmelucan Zapotec |- ! zqe | || || I/L || Tai–Kadai || || Qiubei Zhuang |- ! zra | || || I/H || unclassified || || Kara (Korea) |- ! zrg | || || I/L || Indo-European || || Mirgan |- ! zrn | || || I/L || Afro-Asiatic || || Zerenkel |- ! zro | || || I/L || Zaparoan || || Záparo |- ! zrp | || || I/E || Indo-European || || Zarphatic |- ! zrs | || || I/L || Mairasi || || Mairasi |- ! zsa | || || I/L || Austronesian || || Sarasira |- ! zsk | || || I/H || unclassified / Hatto-Kaskian? || || Kaskean |- ! zsl | || || I/L || unclassified || || Zambian Sign Language |- ! zsm | || || I/L || Austronesian || || Standard Malay |- ! zsr | || || I/L || Zapotec || || Southern Rincon Zapotec |- ! zsu | || || I/L || Austronesian || || Sukurum |- ! (ztc) | || || I/L || || || Lachirioag Zapotec |- ! zte | || || I/L || Zapotec || || Elotepec Zapotec |- ! ztg | || || I/L || Zapotec || || Xanaguía Zapotec |- ! ztl | || || I/L || Oto-Manguean || Lapaguía-Guivini Zapotec || Lapaguía-Guivini Zapotec |- ! ztm | || || I/L || Zapotec || || San Agustín Mixtepec Zapotec |- ! ztn | || || I/L || Zapotec || || Santa Catarina Albarradas Zapotec |- ! ztp | || || I/L || Zapotec || || Loxicha Zapotec |- ! ztq | || || I/L || Zapotec || || Quioquitani-Quierí Zapotec |- ! zts | || || I/L || Zapotec || || Tilquiapan Zapotec |- ! ztt | || || I/L || Zapotec || || Tejalapan Zapotec |- ! ztu | || || I/L || Zapotec || || Güilá Zapotec |- ! ztx | || || I/L || Zapotec || || Zaachila Zapotec |- ! zty | || || I/L || Oto-Manguean || || Yatee Zapotec |- ! (zua) | || || I/L || Afro-Asiatic || || Zeem |- ! zuh | || || I/L || Trans–New Guinea || || Tokano |- ! zul | zu || zul || I/L || Niger–Congo || isiZulu || Zulu |- ! zum | || || I/L || Indo-European || || Kumzari |- ! zun | || zun || I/L || isolate || || Zuni |- ! zuy | || || I/L || Afro-Asiatic || || Zumaya |- ! zwa | || || I/L || Afro-Asiatic || || Zay |- ! zxx | || zxx || S/S || || || No linguistic content; Not applicable |- ! zyb | || || I/L || Tai–Kadai || || Yongbei Zhuang |- ! zyg | || || I/L || Tai–Kadai || || Yang Zhuang |- ! zyj | || || I/L || Tai–Kadai || || Youjiang Zhuang |- ! zyn | || || I/L || Tai–Kadai || || Yongnan Zhuang |- ! zyp | || || I/L || Sino-Tibetan || || Zyphe Chin |- ! zza | || zza || M/L || Indo-European || || Dimili; Dimli (macrolanguage); Kirdki; Kirmanjki (macrolanguage); Zaza; Zazaki |- ! zzj | || || I/L || Tai–Kadai || || Zuojiang Zhuang |}