Joseph I
Joseph I or Josef I may refer to:
- Joseph I of Constantinople, Ecumenical Patriarch in 1266–1275 and 1282–1283
- Joseph I, Holy Roman Emperor
- Joseph I (Chaldean Patriarch)
- Joseph I of Portugal
- Joseph Bonaparte, brother of Napoleon Bonaparte, who reigned in Naples and Spain as Joseph I
- Joseph I of Bulgaria
- Joseph Wenzel I, Prince of Liechtenstein