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