Louis de La Trémoille, 1st Duke of Thouars (1521 – 25 March 1577) was a sixteenth-century French nobleman of the La Tremoille family.

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.

[1] They had five children, including: Louis served in Italy under Marshal de Cossé.

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.

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