The section below provides an outline listing of all the languages described in this chart. For a complete listing of all Indo-European languages, see the Indo-European Language Family.

Languages marked with a dagger (†) are extinct.

Major language groups are listed in alphabetical order.
No importance should be inferred from the order of the languages in the listing.

• Proto-Indo-European
• Anatolian†
  • Hittite†
• Celtic
  • Gaulish†
  • Manx†
  • Irish Gaelic
  • Scots Gaelic
  • Cornish
  • Breton
  • Welsh
• Germanic
  • West Germanic
    • Old English
      • English
      • Scots
    • High German
      • Yiddish
    • North Frisian
    • West Frisian
    • Low Saxon/Low Franconian
      • East Frisian
      • Low German
      • Flemish
      • Dutch
        • Afrikaans
  • East Germanic
    • Gothic†
  • North Germanic
    • Old Norse
      • Western Old Norse
        • Icelandic
        • Faroese
        • Norwegian
      • Eastern Old Norse
        • Danish
        • Swedish
• Hellenic
  • Ancient Greek
    • Modern Greek
• Italic
  • Latin†
    • Catalan
    • French
    • Galician
    • Italian
    • Portuguese
    • Provençal
    • Romansch
    • Romanian
    • Spanish
    • Osco-Umbrian†
• Tocharian†
  • Tocharian†