Ian MacKenzie or McKenzie may refer to:
Ian Alistair Mackenzie (1890–1949), Canadian parliamentarian Ian MacKenzie (swimmer) (born 1953), Canadian former swimmer Iain McKenzie (born 1959), Scottish Labour politician Ian Mackenzie-Kerr (1929–2005), British book designer Ian Clayton Mackenzie (1909–2009), British diplomat Ian MacKenzie (footballer) (1950–2018), English footballer