| Louis de La Trémoille | |
| Noble Family: | La Tremoille |
| Father: | François II de La Trémoille |
| Mother: | Anne de Laval |
| Spouse: | Jeanne de Montmorency |
| Issue: | Louis, Count of Benon Claude, 2nd Duke of Thouars Charlotte Catherine, Princess of Condé |
| Birth Date: | 1521 |
| Death Date: | 25 March |
| Death Place: | Melle |
Louis de La Trémoille, 1st Duke of Thouars (1521 – 25 March 1577) was a sixteenth-century French nobleman of the La Tremoille family. He was the son of François II de La Trémoille and his wife, Anne de Laval. Louis accompanied the dauphin on a voyage to Perpignan in 1542, served in the war against the English in Picardy and was one of the four barons given as a hostage of the Holy Ampoule at the consecration of Henry II, and one of the hostages of the peace treaty concluded in 1542 between France and England. In 1563 his title was raised to a dukedom.
In 1549, he married Jeanne de Montmorency (1528–1596), the second daughter of Anne de Montmorency. They had five children, including:
Louis served in Italy under Marshal de Cossé. In 1560, he was a lieutenant general of Poitou and of Saintonge. He was charged, in 1567, with the command of the Loire Valley, served under the Duke of Anjou and was killed at the siege of Melle on 25 March 1577, at the moment when the city fell.