- John Calvin (10 July 1509 – 27 May 1564) Protestant Reformer, founder of Calvinism or reformed theology.
- Jakob Abbadie (1654–1727), Protestant preacher
- Gilberto Agustoni (born 1922), cardinal
- Jacob Amman (17th century)
- Karl Barth (1886–1968), theologian
- Theodore Beza (1519–1605), reformer in Geneva
- Heinrich Bullinger (1504–1575), reformer in Zurich
- Georges Cottier (born 1922), cardinal, theologian
- Niklaus Manuel Deutsch (1484–1530) painter, dramatician, politician and reformer in Berne
- Johann Augustanus Faber (c.1470–c.1530), theologian and historian
- William Farel (1489–1565), reformer in Geneva
- Theodosius Florentini (1808–1865)
- Gaston Frommel (1862–1906)
- Berchtold Haller (1492–1536), reformer in Berne
- Karl Rudolf Hagenbach (1801–1874)
- Johann Jakob Herzog (1805–1882)
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- Hans Küng (born 1928), theologian
- Johann Kaspar Lavater (1741–1801), pastor and physiognomist
- Oswald Myconius (1488–1552)
- Johannes Oecolampadius (1482–1531), reformer in Basel
- Frère Roger (1915–2005), founder of Taizé
- Philip Schaff (1819–1893)
- Henri Schwery (born 1932), cardinal, former Bishop of Sion
- Guichard Tavelli (died 1375), Bishop of Sion
- Clemens Thoma (1932–2011)
- Alexandre Rodolphe Vinet (1797–1847), theologian and critic
- Pierre Viret (1511–1571), reformer in Vaud Canton
- Lukas Vischer (1926–2008), theologian and writer
- Johann Jakob Wettstein (1693–1754), theologian
- John Joachim Zubly (Hans Joachim Züblin), (1724–1781), pastor, delegate to the Continental Congress
- Huldrych Zwingli (1484–1531), reformer in Zurich
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