Rudolf Ritsema (October 3, 1918, Velp, Gelderland – May 8, 2006) was the director of the Fondazione Eranos (Eranos Foundation) for over thirty years and the editor of the Eranos‑Jahrbuch serial (beginning with its vol. 38 published in 1972). Together with Shantena Augusto Sabbadini (b. 1943), the Italian physicist and spiritual thinker, he produced the first Italian rendering of the I Ching based directly on the Chinese original.