Joan I or Joanna I may refer to:

  • Joan I, Countess of Burgundy (1191–1205)
  • Joan I of Navarre (1271–1305), daughter of King Henry I of Navarre and Blanche of Artois
  • Joan I, Countess of Auvergne (1326–1360)
  • Joanna I of Naples (1328–1382)
  • Joan I, Countess of Dreux (1345 – 1346), only child of Peter, Count of Dreux
  • Joanna of Castile (1479–1555), a.k.a. Joanna I or Juana I, Queen of Castile and Aragon, daughter of Isabella I of Castile and Ferdinand II of Aragon<!--note: Joanna I & es:Juana I redirects to disambiguation Joan I (here)--->

See also

  • Joan Ramon I, Count of Cardona (1375-1441), Catalan nobleman

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