John Cowan (born 1952) is an American musician.

John Cowan may also refer to:

Politics and law

• John Cowan, Lord Cowan (1798–1878), Senator of the College of Justice in Scotland
• Sir John Cowan (sheriff) (died 1842), Lord Mayor of London
• John Cowan (Newfoundland politician) (1847–1927), politician in Newfoundland
• John F. Cowan (1858–1917), North Dakota lawyer, politician, Attorney General, and judge
• Sir John Cowan (South Australian politician) (1866–1953), Australian politician
• John Lancelot Cowan (1893–1971), Australian politician

Science and medicine

• John Black Cowan (1828–1896), professor of medicine at the University of Glasgow
• John Cowan (physician) (fl. 1870s), American physician and phrenologist
• John Macqueen Cowan (1892–1960), Scottish botanist

Sports

• John Cowan (footballer, born 1870) (1870–1937), Scottish footballer
• Johnnie Cowan (1913–1993), American baseball player
• John Cowan (footballer, born 1949), Northern Ireland international footballer

Others

• Sir John Cowan, 1st Baronet (1814–1900), of the Cowan baronets, philanthropist
• John Cowan (steel merchant) (1844–1929), Scottish iron and steel merchant
• John Cowan (photographer) (1929–1979), British fashion photographer
• John Cowan (RAN officer) (born 1957), Australian navy officer
• John W. Cowan, American computer programmer

See also

• Jon Cowan, American television producer and writer
• Jack Cowan (1927–2000), footballer
• John Cowans (1862–1921), Quartermaster-General to the Forces
• John Kissig Cowen (1844–1904), American railroad executive and congressman
• Cowan (surname)
• Cowan (disambiguation)