McCuaig is a surname. Notable people with the surname include:
Bradley McCuaig (born 1970), Canadian sprinter Duncan Fletcher McCuaig (1889–1950), Canadian politician Duncan John McCuaig (1882–1960), Canadian politician James Simeon McCuaig (1819–1888), Canadian politician Ronald McCuaig (1908–1993), Australian poet Scott McCuaig (born 1984), Canadian football player Stanley Harwood McCuaig (1891–1986), Canadian lawyer
See also Marg McCuaig-Boyd (born 1952), Canadian politician