Jack Fox may refer to:

• Jack Fox (actor) (born 1985), English actor
• Jack Fox (baseball) (1885–1963), American professional baseball player
• Tiger Jack Fox (1907–1954), American light heavyweight boxer
• J. G. Fox (1916–1980), known as Jack, American nuclear physicist
• Jack Foxx, a pen name of Bill Pronzini (born 1943), American writer of detective fiction