Theobald I may refer to:

  • Theobald I, King of Austrasia, ruled 548-555
  • Theobald I, Count of Blois, ruled 928–975
  • Theobald I, Count of Champagne ruled 1037–1089
  • Theobald I, Duke of Lorraine (c. 1191 – 1220)
  • Theobald I, King of Navarre ruled 1234–1253