John Slocum may refer to:
Colonel John S. Slocum (1824–1861), namesake of Fort Slocum (Washington, D.C.) John Slocum (1838–1897), the founder of the Indian Shaker Church John W. Slocum (1867–1938), American lawyer and politician John J. Slocum (1914–1997), diplomat and bibliographer John L. Slocum (1920–1998), inventor of the Slocum stone