Abraham Ruchat (27 February 1680, in Vevey – 29 September 1750, in Lausanne) was a Swiss Protestant theologian and historian. He studied theology at the Academy of Lausanne, receiving his ordination in 1702. Later on, he served as a minister in the communities of Aubonne (1709–16) and Rolle (1716–21). In 1721 he was appointed professor of rhetoric at the Academy, where from 1733 up until his death, he taught classes in theology. In 1736–39 he served as school rector.