| Tomasso I | |
| Marchese di Saluzzo | |
| Reign: | 1244–1296 |
| Predecessor: | Manfredo III |
| Successor: | Manfredo IV |
| Spouse: | Luigia di Ceva |
| Issue: | Manfredo IV Alice FitzAlan, Countess of Arundel |
| House: | House of Aleramici |
| Father: | Manfredo III |
| Mother: | Beatrice of Savoy |
| Birth Date: | 1239 |
| Death Date: | 1296 |
Thomas I (1239–1296) was the fourth Marquess of Saluzzo from 1244 to his death. He was the son of Manfred III and Beatrice of Savoy. He succeeded his father Manfred III. He was also the grandson of Amadeus IV, Count of Savoy.
Under the reign of Thomas, Saluzzo blossomed, achieving a greatness which had eluded his ancestors. He crafted a state the borders of which remained unchanged for over two centuries. He extended the march to include Carmagnola. He was often at odds with Asti and he was a prime enemy of Charles of Anjou and his Italian pretensions. During his tenure, he made Saluzzo a free city, giving it a podestà to govern in his name. He defended his castles and roccaforti (strongholds) vigorously and built many new ones in the cities.
He married Luisa of Ceva. They had: