Jacob Philip (Jaap) van Praag (11 May 1911, Amsterdam - 12 April 1981, Utrecht) was a Dutch humanist who played a prominent role in establishing the Dutch Humanist League. He was its Chairman from 1946 to 1969. And, from 1954 to 1974, he was a member of a provincial Executive.
Van Praag was one of the first professors in Humanist studies in University of Leiden (1964-1979). He played a major role in the founding of the International Humanist and Ethical Union.