MacKinlay is a surname. Notable people with the surname include:
Andrew MacKinlay (born 1949), British Labour Party politician, Member of Parliament for Thurrock 1992–2010
Craig Mackinlay, British Eurosceptic politician
Jock D. Mackinlay, American information visualization expert and Director of Visual Analysis at Tableau Software
Leila Mackinlay (1910–1996), British writer of romance novels from 1930 to 1979
MacKinlay Kantor (1904–1977), born Benjamin McKinlay Kantor, American journalist, novelist and screenwriter