Werner Kaegi (February 22, 1901 – June 15, 1979) was a Swiss historian. He is best known for a single work, a biography of Jacob Burkhardt. This appeared in seven volumes, from 1947 to 1982.
His wife was the Catholic mystic and stigmatistAdrienne von Speyr (1902–1967). Her spiritual director and friend, the theologian Hans Urs von Balthasar, kept a journal during many years about her life in which details regarding her relationship with Werner Kaegi can be found. This journal was later edited in 3 volumes under the name "Erde und himmel" ("Earth and heaven").