Theobald I.
Theobald I. designates the following persons:
- Theobald I. (Blois) (called the deceiver ; ~ 910–975), Vice Count of Blois and Tours
- Theobald I (Champagne) (~ 1010–1089), Count of Blois and Count of Meaux, Troyes
- Theobald I. (Bar) (~ 1158–1214), Count of Bar
- Theobald I (Lorraine) (~ 1191–1220), Duke of Lorraine
- Theobald I (Navarre) (1201–1253), Count of Champagne, King of Navarre