McGrattan is a surname. Notable people with the surname include:
Brian McGrattan (rugby union) (born 1959), New Zealand rugby union player Brian McGrattan (born 1981), Canadian ice hockey player Gerard McGrattan (born 1972), Northern Ireland hurler Johnny McGrattan (born 1977), Northern Ireland hurler Tom McGrattan (1927–2022), Canadian ice hockey player William McGrattan (born 1956), Canadian Catholic bishop