| FAMILY | GROUP | SUBGROUP | LANGUAGES & DIALECTS | 
| Anatolian |  |  | Hieroglypic Hittite, Hittite (Kanesian), Luwian, Lycian, Lydian, Palaic | 
| Baltic |  |  | Latvian, Lithuanian, Old Prussian | 
| Celtic | Brythonic |  | Breton, Cornish, Welsh | 
| Continental |  | Gaulish | 
| Gaelic |  | Irish Gaelic, Manx, Scottish Gaelic | 
| Germanic | East Germanic |  | Burgundian, Gothic, Vandalic | 
| North Germanic |  | Norse, Danish, Faeroese, Icelandic, Norwegian, Swedish | 
| West Germanic | High German | German, Yiddish | 
| Low German | Afrikaans, Dutch, English, Flemish, Frisian, Plattdeutsch | 
| Greek |  |  | Aeolic, Arcadian, Attic, Byzantine Greek, Cyprian, Doric, Ionic, Koine, Modern 
Greek | 
| Indo-Iranian | Dardic or Pisacha |  | Kafiri, Kashmiri, Khowar, Kohistani, Romany (Gypsy), Shina | 
| Indic or Indo-Aryan | Ancient | Pali, Prakrit, Sanskrit, Vedic | 
| Central Indic | Hindi, Hindustani, Urdu | 
| East Indic | Assamese, Bengali, Bihari, Oriya | 
| Northwest Indic | Punjabi, Sindhi | 
| Pahari | Central Pahari, Eastern Pahari (Nepali), Western Pahari | 
| South Indic | Marathi, Konkani, Sinhalese | 
| West Indic | Bhili, Gujarati, Rajasthani dialects | 
| Iranian | Ancient | Avestan, Old Persian | 
| East Iranian | Baluchi, Khwarazmian, Ossetic, Pamir dialects, Pushtu (Afghan), Saka (Khotanese), 
Sogdian, Yaghnobi | 
| West Iranian | Kurdish, Pahlavi (Middle Persian), Parthian, Persian (Farsi), Tajiki | 
| Italic | (Non-Romance) |  | Faliscan, Latin, Oscan, Umbrian | 
| Romance | Eastern Romance | Italian, Rhaeto-Romanic, Romanian, Sardinian | 
| Western Romance | Catalan, French, Ladino, Portuguese, Provençal, Spanish | 
| Slavic | East Slavic |  | Bielarussian, Russian, Ukrainian | 
| South Slavic |  | Bulgarian, Church Slavonic, Macedonian, Serbo-Croatian, Slovenian | 
| West Slavic |  | Czech, Kashubian, Lusatian, Polabian, Polish, Slovak | 
| Thraco-Illyrian |  |  | Albanian, Illyrian, Thracian | 
| Thraco-Phrygian |  |  | Armenian, Grabar, Phrygian | 
| Tokharian |  |  | Tokharian A (Agnean), Tokharian B (Kuchean) |