Gilmartin is a surname. Notable people with the surname include:
Charlotte Gilmartin (born 1990), English speed skater Ian Gilmartin, British inventor L. Gilmartin, 19th-century Scottish footballer Mark Gilmartin (born 1963), American golf administrator Mike Gilmartin (born 1986), American football player Paul Gilmartin (born 1963), American comedian Phil Gilmartin, British molecular biologist and botanist Raymond Gilmartin (born 1941), American businessman Rene Gilmartin (born 1987), Irish footballer Sean Gilmartin (born 1990), American baseball player Thomas Gilmartin (1861–1939), Irish Roman Catholic clergyman Tom Gilmartin (disambiguation), multiple people