Ylvisaker is a surname. Notable people with the surname include:
Don Ylvisaker (1933–2022), American mathematical statistician J. W. Ylvisaker (1900–1981), American college president Jeremy Ylvisaker, American multi-instrumentalist William T. Ylvisaker (1924–2010), American businessman and polo player
See also Ylvis, a Norwegian comedy duo consisting of Vegard and Bård Ylvisåker