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, 1st Baronet, of London (1774–1842), 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 (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, of Beeslack (1814–1900), Scottish philanthropist Sir 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 Jack D. Cowan (1933–2025), British mathematician and theoretical neuroscientist John Cowans (1862–1921), British Army officer John K. Cowen (1844–1904), American railroad executive and congressman Cowan (surname) Cowan (disambiguation)