Louis Ruffet (13 April 1836, in Nyon – 1923) was a Swiss Protestant theologian and church historian.

In 1859 he received his bachelor's degree in theology at the École de theologie in Geneva and became ordained as a minister at the Église de l'Oratoire. He served as a minister in the French communities of Royan, Le Creusot and Aix-les-Bains, and in 1861 returned to Geneva as a minister at the Église de l'Oratoire, where he preached until 1869. In 1870–72 he worked as a director of a seminary in Lausanne, and afterwards, taught classes in church history at the École de théologie in Geneva. In 1874 he was awarded an honorary doctorate in theology from Princeton University.^[1][2]

Selected works

• Thascius Cyprien, évêque de Carthage et les persécutions de son temps, 1872 – Cyprian, bishop of Carthage and the persecutions of his time.
• (François) Lambert d'Avignon, le réformateur de la Hesse – Francis Lambert of Avignon, the reformer of Hesse.
• Pietro Carnesecchi, un martyr de la Réforme en Italie, 1874 – Pietro Carnesecchi, a martyr of the Reformation in Italy.
• Vie de César Pronier et fragments de ses écrits, 1875 – Life of Caesar Pronier and fragments of his writings.
• J.-L. Micheli : Notice biographique, 1875 – Biographical notice of Jean-Louis Micheli.
• Un grand libéral chrétien : le comte Agénor de Gasparin, 1884 – A great liberal Christian, Agénor de Gasparin.
• Georges Fox et les origines du Quakerisme 1624-1660, 1886 – George Fox and the origins of Quakerism, 1624–60.
• Le devoir des chrétiens évangéliques dans la question de l'esclavage en Afrique, 1891 – The duty of evangelical Christians regarding the issue of slavery in Africa.
• Luther et la diète de Worms, 1903 – Martin Luther and the Diet of Worms.
• Calvin et Servet : leçon publique, 1910 – John Calvin and Michael Servetus, public lessons.
• Jean Hus, le réformateur de la Bohême – John Hus, the reformer of Bohemia.^[3]