Kilmartin is a surname with Irish and Scottish origins. People with the name include:
Gerald Kilmartin (1927–1970), American ice hockey player Jay Kilmartin, American politician from South Carolina John F. Kilmartin (1921–2004) Laurie Kilmartin, American comedian Pamela M. Kilmartin, New Zealand astronomer Peter Kilmartin (b. 1962), American attorney Terence Kilmartin (1922–1991), Irish journalist and translator