John Ewart (1928–1994) was an Australian actor
John Ewart may also refer to: John Ewart (architect) (1788–1856), Canadian architect and business John Albert Ewart (1872–1964), Canadian architect Jock Ewart (1891–1943), Scottish footballer John Ewart (doctor) (1858–1939), New Zealand doctor and hospital superintendent J. S. Ewart (John Skirving Ewart, 1849–1933), Canadian lawyer and author Sir John Alexander Ewart (1821–1904), Scottish military leader