Halpin is an Irish surname. It is an Anglicized form of the Gaelic patronymic Ó hAlpín, meaning 'descendant of Alpin'. Other Anglicized versions of the surname include Halfpenny and Halpenny, and these variants were often used interchangeably prior to widespread literacy in Ireland. For example, the registers of St Peter's Catholic Church, Drogheda, Louth record the variations Halpin, Halfpenny, and Halpenny used throughout the 18th and 19th centuries for demonstrably related individuals.
Notable people with the surname include:
- Anita Halpin (born 1944), British politician
- Hal Halpin, American computer game executive & entrepreneur
- Jim Halpin (1863–1893), English baseball player
- John Halpin (born 1961), Scottish football player
- Luke Halpin (born 1947), American actor
- Marjorie Halpin (1937–2000), U.S.-Canadian anthropologist
- Patrick G. Halpin, American executive & talk show host
- Robert Halpin (1836–1894), Irish sea captain
- Scot Halpin, American drummer
- Terry Halpin, Australian professor
- Troy Halpin (born 1973), Australian football player