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

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