Thomas I or Tommaso I (b. 1178 - d. 1233) was Count of Savoy from 1189 - 1233. He was the son of Humbert III of Savoy and Beatrice of Vienna.

He married:

1. Beatrice of Geneva
2. Margaret of Faucigny, d. 1258 and had 10 children:

1. Amedeo
2. Humbert, d. between March and November 1223
3. Tommaso
4. Aymon, d. August 30 1237, Lord of Chablais
5. William, Bishop of Valenceand Dean of Vienne
6. Amadeus of Savoy, Bishop of Maurianne
7. Pietro
8. Filippo
9. Bonifacio
10. Beatrice, d. 1265 or 1266, married in December 1219 to Ramon Berenguer IV, Count of Provence (1209-1245)
11. Alice of Savoy, abbess of the monastery of St Pierre in Lyon
12. Ágatha of Savoy, abbess of the monastery of St Pierre in Lyon
13. Margaret (Marguerite in Italian), d. 1273, married in 1218 to Hartman the Old, d. 1264, Count of Kyburg
14. Avita of Savoy, married Baudwin of Rivieres, count of Devon + 1261

Preceded by: Humbert III

Count of Savoy

Succeeded by: Amadeus IV