Elaine Showalter (b. 1941), an American literary critic, feminist, and writer on cultural and social issues

Buck Showalter (b. 1956), a former professional baseball player and manager

Max Showalter (1917-2000), an American film, television and stage actor

Michael Showalter (b. 1970), an American actor, writer, and director and part of the sketch comedy trio Stella

Joseph Baltzell Showalter (1851–1932), a Republican member of the U.S. House of Representatives from Pennsylvania

Gena Showalter (b. 1975), an American Author in the genres of Contemporary Romance, Paranormal Romance, and Young Adult

Jackson Showalter (1860–1935), a 5-time U.S. Chess Champion

Anthony Johnson Showalter (1858 - 1924), an American gospel music composer, teacher and publisher

Don Showalter, a professor and former chairman of the Department of Chemistry at the University of Wisconsin-Stevens Point