Below we list Indo-European languages by family, from west to east. Families are divided into groups, by age and/or geographic area (again, generally from west to east). Each language is listed via a standard abbreviation followed by its full-form name; "a.k.a." comments may indicate synonymous language/dialect names.
If we have prepared an alphabetic index to a particular language's reflexes -- words & affixes therein, derived from ancient Proto-Indo-European etyma -- a link is provided to a page (available in 3 character-set versions) listing those reflexes. This work is in progress: reflex indices are being added on a language-by-language basis, as time goes on, for languages with 10 or more reflexes.
Because our IE Lexicon currently emphasizes Germanic languages, especially English, we have split the Germanic family into four convenient but partly imaginary sub-families:
In addition, our Paleo-Balkan "family" lists languages in four groups, of which only Albanian is well-attested and that only recently; the languages in the other groups do not necessarily form a family with Albanian (or each other), but are listed with it mainly for geographic reasons and because there is no other place to put them. No hard conclusions should be drawn from our Paleo-Balkan "family" structure: it is, at best, speculative!
While the Nuristani languages are now considered a third branch of the Indo-Iranian family, the status of the Dardic languages is less clear. Traditionally, Dardic was assigned to the Indic branch; but this was less than certain and, indeed, the languages in our Dardic "family" do not necessarily form a single genetic tree. We have tentatively listed Dardic alongside Indic, next to the Nuristani languages by which Dardic tongues are known to be influenced. Again, no hard conclusions should be drawn from this structural detail.
| Celtic | ||||
| Insular (Goidelic) | ||||
| OIr. | Old Irish | |||
| MIr. | Middle Irish | |||
| Ir. | Irish | a.k.a. Irish Gaelic | ||
| Gael. | Gaelic | a.k.a. Scots Gaelic | ||
| ScotG | Scots Gaelic | |||
| Manx | Manx | a.k.a. Manx Gaelic | ||
| Shel. | Shelta | |||
| Insular (Brythonic) | ||||
| OBret. | Old Breton | |||
| MBret. | Middle Breton | |||
| Bret. | Breton | |||
| OCorn. | Old Cornish | |||
| MCorn. | Middle Cornish | |||
| Corn. | Cornish | |||
| Cumb. | Cumbric | |||
| OW | Old Welsh | |||
| MW | Middle Welsh | |||
| W | Welsh | |||
| Continental | ||||
| Celt. | Celtiberian | |||
| Gaul. | Gaulish | |||
| TGaul. | Transalpine Gaulish | |||
| CGaul. | Cisalpine Gaulish | |||
| Lep. | Lepontic | |||
| Noric | Noric | |||
| Gal. | Galatian | |||
| English | ||||
| Old | ||||
| OE | Old English | a.k.a. Anglo-Saxon | ||
| AS | Anglo-Saxon | |||
| WSax. | West Saxon | |||
| Angl. | Anglian | |||
| NUmb. | Northumbrian | |||
| Merc. | Mercian | |||
| Kent. | Kentish | |||
| Middle | ||||
| ME | Middle English | |||
| Modern | ||||
| E | English | a.k.a. New English | ||
| NE | New English | |||
| AmEng | American English | |||
| BritE | British English | |||
| ScotE | Scots English | |||
| West Germanic | ||||
| Low German (Anglo-Frisian) | ||||
| OFris. | Old Frisian | |||
| OWFris. | Old West Frisian | |||
| MFris. | Middle Frisian | |||
| Fris. | Frisian | |||
| WFris. | West Frisian | a.k.a. Dutch/Netherlands Frisian | ||
| NFris. | North Frisian | |||
| EFris. | East Frisian | |||
| Sater. | Saterfriesisch | |||
| Low German (Dutch, Saxon, etc.) | ||||
| OF | Old Frankish | a.k.a. Old Franconian | ||
| ODu. | Old Dutch | a.k.a. Old Low Franconian | ||
| OLF | Old Low Franconian | |||
| MDu. | Middle Dutch | |||
| Du. | Dutch | |||
| Afrik. | Afrikaans | |||
| F | Franconian | a.k.a. Mainfränkisch | ||
| OFlem. | Old Flemish | |||
| MFlem. | Middle Flemish | |||
| Flem. | Flemish | |||
| WFlem. | West Flemish | |||
| Limb. | Limburgish | a.k.a. Limburger, Limburgan | ||
| PaG | Pennsylvania German | a.k.a. Pennsylvania Dutch | ||
| OS | Old Saxon | a.k.a. Old Low German | ||
| OLG | Old Low German | |||
| MLG | Middle Low German | |||
| LG | Low German | a.k.a. Low Saxon | ||
| LS | Low Saxon | a.k.a. Low Franconian | ||
| Thur. | Thuringian | |||
| High German | ||||
| OHG | Old High German | |||
| MHG | Middle High German | |||
| MG | Middle German | a.k.a. Frankish | ||
| ENHG | Early New High German | |||
| NHG | New High German | a.k.a. (Standard) German | ||
| G | German | a.k.a. Standard German | ||
| Bav. | Bavarian | a.k.a. Austro-Bavarian | ||
| Alm. | Alemannic | |||
| Swab. | Swabian | |||
| Swiss | Swiss German | a.k.a. Alsatian, Schwyzerdütsch | ||
| Wals. | Walser | |||
| Yid. | Yiddish | |||
| Lux. | Luxembourgish | |||
| Lang. | Langobardic | a.k.a. Lombardic | ||
| North Germanic | ||||
| Run. | Runic | |||
| ON | Old Norse | |||
| West Norse | ||||
| OWN | Old West Norse | |||
| OIce. | Old Icelandic | |||
| Ice. | Icelandic | |||
| Faer. | Faeroese | a.k.a. Faroese | ||
| Norn | Norn | |||
| ONorw. | Old Norwegian | |||
| MNorw. | Middle Norwegian | |||
| Norw. | Norwegian | |||
| NBok. | Norwegian Bokmål | |||
| NNorw. | New Norwegian | a.k.a. Nynorsk | ||
| Jamt. | Jamtska | |||
| East Norse | ||||
| OEN | Old East Norse | |||
| ODan. | Old Danish | |||
| MDan. | Middle Danish | |||
| Dan. | Danish | |||
| OSw. | Old Swedish | |||
| MSw. | Middle Swedish | |||
| Sw. | Swedish | |||
| OGut. | Old Gutnish | |||
| Gut. | Gutnish | |||
| East Germanic | ||||
| Gothic | ||||
| Go. | Gothic | |||
| VisGo. | Visigoth | |||
| OstGo. | Ostrogoth | |||
| CrGo. | Crimean Gothic | |||
| other (all marginally attested) | ||||
| Vand. | Vandalic | |||
| Burg. | Burgundian | |||
| Italic | ||||
| Ven. | Venetic | |||
| Aeq. | Aequian | |||
| Vest. | Vestinian | |||
| Sabellic | ||||
| Osc. | Oscan | |||
| Hern. | Hernican | |||
| Marr. | Marrucinian | |||
| Pael. | Paelignian | |||
| Umb. | Umbrian | |||
| Mars. | Marsian | |||
| Sab. | Sabine | |||
| SPic. | South Picene | |||
| Vol. | Volscian | |||
| Latino-Faliscan | ||||
| Fal. | Faliscan | |||
| OLat. | Old Latin | |||
| Lat. | Latin | |||
| VLat. | Vulgar Latin | |||
| LLat. | Late Latin | |||
| MLat. | Middle Latin | |||
| MELat. | Medieval Latin | a.k.a. Low Latin | ||
| NLat. | New Latin | |||
| Western Romance | ||||
| OPort. | Old Portuguese | a.k.a. Medieval Galician, Galician-Portuguese | ||
| Port. | Portuguese | |||
| Gali. | Galician | a.k.a. Galego | ||
| OSp. | Old Spanish | |||
| MSp. | Middle Spanish | |||
| ClSp. | Classical Spanish | |||
| Lad. | Ladino | a.k.a. Sefardi, Judaeo-Spanish | ||
| Sp. | Spanish | |||
| AmSp. | American Spanish | a.k.a. New World Spanish | ||
| MexSp. | Mexican Spanish | |||
| Arag. | Aragonese | |||
| OCat. | Old Catalan | |||
| Cat. | Catalan | |||
| OFr. | Old French | |||
| ONFr. | Old North French | |||
| AngFr. | Anglo-French | a.k.a. Anglo-Norman | ||
| Wall. | Walloon | |||
| MFr. | Middle French | |||
| Fr. | French | |||
| AmFr. | American French | |||
| CanFr. | Canadian French | a.k.a. Quebec French | ||
| AcadFr. | Acadian French | |||
| LaFr. | Cajun French | |||
| OProv. | Old Provençal | a.k.a. Old Occitan | ||
| OOcc. | Old Occitan | |||
| Occ. | Occitan | a.k.a. Occitanian | ||
| Prov. | Provençal | |||
| OIt. | Old Italian | |||
| It. | Italian | |||
| Neap. | Neapolitan | |||
| Rom. | Romansh | a.k.a. Romansch, Rhaeto-Romance | ||
| Insular Romance | ||||
| Cors. | Corsican | |||
| Sard. | Sardinian | |||
| Sic. | Sicilian | |||
| Eastern Romance | ||||
| Dalm. | Dalmatian | |||
| Rum. | Rumanian | a.k.a. Romanian | ||
| Mold. | Moldavian | a.k.a. Moldovan | ||
| Arom. | Aromanian | a.k.a. Arumanian, Macedo-Romanian | ||
| Istr. | Istro Romanian | |||
| Megl. | Megleno Romanian | |||
| Balto-Slavic | ||||
| Baltic | ||||
| Nadr. | Nadruvian | |||
| Skal. | Skalvian | |||
| West | ||||
| Galin. | Galindan | |||
| Sudo. | Sudovian | a.k.a. Yotvingian | ||
| OPrus. | Old Prussian | a.k.a. Prussian | ||
| East | ||||
| Curo. | Curonian | |||
| Sel. | Selonian | |||
| Zem. | Zemgalian | a.k.a. Semigallian | ||
| OLith. | Old Lithuanian | |||
| LLith. | Low Lithuanian | |||
| Lith. | Lithuanian | |||
| Latv. | Latvian | a.k.a. Lettish | ||
| Slavic | ||||
| OSlav. | Old Slavic | |||
| West | ||||
| OPol. | Old Polish | |||
| Pol. | Polish | |||
| OPom. | Old Pomeranian | |||
| Kashub. | Kashubian | |||
| Polab. | Polabian | |||
| OCz. | Old Czech | |||
| Cz. | Czech | |||
| Knaan. | Knaanic | a.k.a. Canaanic, Judeo-Slavic, Leshon Knaan | ||
| Slovak | Slovak | |||
| OSorb. | Old Sorbian | |||
| Wend. | Wendish | a.k.a. Sorbian | ||
| Sorb. | Sorbian | |||
| USorb. | Upper Sorbian | |||
| LSorb. | Lower Sorbian | |||
| Lusat. | Lusatian | |||
| South | ||||
| OSerb. | Old Serbian | |||
| SCr. | Serbo-Croatian | |||
| Serb. | Serbian | |||
| Croat. | Croatian | |||
| Bosn. | Bosnian | |||
| Slovene | Slovenian | |||
| OCS | Old Church Slavonic | a.k.a. Old Bulgarian | ||
| LCS | Late Church Slavic | |||
| Bulg. | Bulgarian | |||
| MacSl. | Macedonian Slavic | |||
| East | ||||
| ORuss. | Old Russian | |||
| RCS | Russian Church Slavic | |||
| Russ. | Russian | |||
| Ruth. | Ruthenian | a.k.a. West Russian, Chancery Slavonic | ||
| Belo. | Belorussian | |||
| Ukr. | Ukrainian | |||
| Paleo-Balkan | ||||
| Albanian | ||||
| Alb. | Albanian | |||
| Gheg | Gheg | |||
| Tosk | Tosk | |||
| Arv. | Arvanitika | |||
| Arb. | Arbëreshë | |||
| Illyrian | ||||
| Illyr. | Illyrian | |||
| Mess. | Messapic | a.k.a. Messapian | ||
| Thracian | ||||
| Thrac. | Thracian | |||
| Dac. | Dacian | |||
| Phrygian | ||||
| Phryg. | Phrygian | |||
| Hellenic | ||||
| Myc. | Mycenaean | |||
| Arcad. | Arcadian | a.k.a. Arcadocypriot | ||
| Cyp. | Cyprian | a.k.a. Arcadocypriot | ||
| MacGk. | Macedonian Greek | |||
| Hesy. | Hesychius' Greek Lexicon | |||
| Western | ||||
| Ach. | Achaean | |||
| Dor. | Doric | a.k.a. Dorian | ||
| Elean | Elean | |||
| Lac. | Laconian | a.k.a. Spartan | ||
| Central | ||||
| Aeol. | Aeolic | a.k.a. Aeolian | ||
| Boeot. | Boeotian | |||
| Lesb. | Lesbian | |||
| Thess. | Thessalian | |||
| Eastern | ||||
| Ion. | Ionic | a.k.a. Ionian | ||
| Hom. | Homeric Greek | a.k.a. Epic Greek | ||
| Pamph. | Pamphylian | |||
| Att. | Attic | |||
| Gk. | Greek | a.k.a. Classical Greek | ||
| LGk. | Late Greek | a.k.a. Koine | ||
| MGk. | Medieval Greek | a.k.a. Byzantine Greek | ||
| Modern | ||||
| NGk. | New Greek | a.k.a. Modern Greek | ||
| Cap. | Cappadocian | |||
| Pont. | Pontic | |||
| Tsak. | Tsakonian | |||
| Anatolian | ||||
| Luwian | ||||
| Luw. | Luwian | |||
| CLuw. | Cuneiform Luwian | |||
| HLuw. | Hieroglyphic Luwian | |||
| Lyc. | Lycian | a.k.a. Lycian A | ||
| Mil. | Milyan | a.k.a. Lycian B | ||
| Car. | Carian | |||
| Side. | Sidetic | |||
| Pisid. | Pisidic | a.k.a. Pisidian | ||
| Hittite | ||||
| Hitt. | Hittite | |||
| OHitt. | Old Hittite | |||
| MHitt. | Middle Hittite | |||
| NHitt. | Neo-Hittite | |||
| Pala. | Palaic | |||
| Lyd. | Lydian | |||
| Armenian | ||||
| Classical | ||||
| OArm. | Classical Armenian | a.k.a. Grabar | ||
| Middle | ||||
| MArm. | Middle Armenian | |||
| Modern | ||||
| Arm. | Armenian | |||
| Indo-Iranian | ||||
| Iranian | ||||
| OIran. | Old Iranian | |||
| MIran. | Middle Iranian | |||
| Yas. | Yassic | |||
| Iran. | Iranian | |||
| Western | ||||
| OPers. | Old Persian | |||
| Med. | Median | |||
| Pahl. | Pahlavi | a.k.a. Pehlevi, Middle Persian | ||
| MPers. | Middle Persian | |||
| Mani. | Manichaean | |||
| Parth. | Parthian | |||
| NPers. | New Persian | a.k.a. Persian | ||
| Pers. | Persian | a.k.a. Farsi, Parsi | ||
| Farsi | Farsi | |||
| Balu. | Baluchi | |||
| Kurd. | Kurdish | |||
| Par. | Parachi | |||
| Dari | Dari | |||
| Taj. | Tajik | |||
| Eastern | ||||
| OAv. | Old Avestan | |||
| Av. | Avestan | |||
| YAv. | Young Avestan | |||
| OScyth. | Old Scythian | |||
| Scyth. | Scythian | |||
| Sogd. | Sogdian | |||
| Bact. | Bactrian | |||
| Chor. | Chorasmian | |||
| Alan. | Alanic | |||
| OOss. | Old Ossetic | |||
| Khot. | Khotanese | |||
| Sac. | Sacian | a.k.a. Sakan | ||
| Saka. | Sakan | a.k.a. Sacian | ||
| Tums. | Tumshuqese | |||
| Oss. | Ossetic | a.k.a. Osetin, Ossetian | ||
| Push. | Pushto | a.k.a. Pashto | ||
| Yagn. | Yagnobi | a.k.a. Yaghnobi | ||
| Pamir | Pamir | |||
| Shug. | Shughni | a.k.a. Shugnan, Shugni | ||
| Sari. | Sarikoli | a.k.a. Sarykoly, Salikur | ||
| Yazg. | Yazgulyam | |||
| Munj. | Munji | a.k.a. Munjani | ||
| Ishk. | Ishkashimi | |||
| Sang. | Sanglechi | |||
| Wakh. | Wakhi | a.k.a. Wakhani | ||
| Yidg. | Yidgha | a.k.a. Yidga | ||
| Wane. | Waneci | a.k.a. Wanechi, Vanechi | ||
| Nuristani | ||||
| Pras. | Prasuni | a.k.a. Vasi-vari | ||
| Bash. | Bashgali | a.k.a. Kati, Kamkata-viri | ||
| Ashk. | Ashkunu | |||
| Treg. | Tregami | a.k.a. Gambiri | ||
| Waig. | Waigali | a.k.a. Kalasha-ala | ||
| Dardic | ||||
| Khow. | Khowar | |||
| Kals. | Kalasha | a.k.a. Kalasha-mun | ||
| Kash. | Kashmiri | |||
| Kish. | Kishtwari | |||
| Pogu. | Poguli | |||
| Bat. | Bateri | |||
| Chil. | Chilisso | |||
| Gow. | Gowro | |||
| Kalk. | Kalkoti | |||
| Kalm. | Kalami | |||
| Koh. | Kohistani | |||
| Tira. | Tirahi | |||
| Torw. | Torwali | |||
| Wota. | Wotapuri-Katarqalai | |||
| Dam. | Dameli | |||
| Gawar | Gawar-Bati | |||
| Nang. | Nangalami | |||
| Shum. | Shumashti | |||
| Pash. | Pashayi | a.k.a. Pashai | ||
| PashNW | Pashayi-NW | a.k.a. NW Pashai | ||
| PashSW | Pashayi-SW | a.k.a. SW Pashai | ||
| PashNE | Pashayi-NE | a.k.a. NE Pashai | ||
| PashSE | Pashayi-SE | a.k.a. SE Pashai | ||
| Brok. | Brokskad | a.k.a. Brokskat (?) | ||
| Domk. | Domaaki | |||
| Phal. | Phalura | a.k.a. Palola/Palula/Phalulo | ||
| ShinKo | Shina-Kohistani | |||
| Shina | Shina | |||
| Savi | Savi | |||
| Ush. | Ushojo | |||
| Indic | ||||
| RV | Rigvedic | a.k.a. Rgvedic, Ancient Sanskrit | ||
| Ved. | Vedic | |||
| Skt. | Sanskrit | |||
| Middle | ||||
| Prak. | Prakrit | |||
| Gand. | Gandhari | |||
| Pali | Pali | |||
| Saur. | Sauraseni | |||
| OMart. | Old Marathi | |||
| Modern | ||||
| Assm. | Assamese | |||
| Beng. | Bengali | |||
| Bhil. | Bhili | |||
| Bih. | Bihari | |||
| Domr. | Domari | a.k.a. Luti, Mehtar, Tsigene, Middle Eastern Romani | ||
| Guj. | Gujarati | |||
| Hin. | Hindi | a.k.a. Hindi-Urdu | ||
| Khan. | Khandeshi | |||
| Konk. | Konkani | |||
| Kum. | Kumauni | |||
| Lahn. | Lahnda | |||
| Mald. | Maldivian | |||
| Mart. | Marathi | |||
| Nep. | Nepali | |||
| Ori. | Oriya | |||
| Pnj. | Panjabi | a.k.a. Punjabi | ||
| Raj. | Rajasthani | |||
| Rmy. | Romani | a.k.a. Romany, Gypsy | ||
| Sind. | Sindhi | |||
| Sinh. | Sinhalese | a.k.a. Sinhala | ||
| Thar. | Tharu | |||
| Urdu | Urdu | a.k.a. Hindi-Urdu | ||
| Tocharian | ||||
| Toch. | Tocharian | a.k.a. Common Tokharian | ||
| Western | ||||
| TochB | Tocharian B | a.k.a. Kuchean, Tokharian B | ||
| Eastern | ||||
| TochA | Tocharian A | a.k.a. Turfanian, Tokharian A | ||