Leonhard Ragaz (28 July 1868 – 6 December 1945) was a Swiss Reformed theologian and, with Hermann Kutter, one of the founders of religious socialism in Switzerland.

Born to a farmer family in Tamins, Grisons, on 28 July 1868, Ragaz studied theology in Basel, Jena, and Berlin.

During the Swiss general strike [als; de; fr; he] of 1918, he took sides with the workers, and as the authorities sent troops to protect the university buildings from the strikers, he protested.

As a consequence, the socialist ideal of self-administered cooperatives owned by the workers themselves was a postulate directly derived from the gospel and the promise of justice in God's kingdom.

Ragaz' main work is Die Bibel – eine Deutung ("The Bible - An Interpretation"), written during the Second World War and published in seven volumes in 1947–1950.