John Lilly may refer to:
John C. Lilly (1915–2001), American physician, psychoanalyst and writer John Lilly (computer scientist) (born 1971), former chief executive officer of the Mozilla Corporation John Lilly (priest) (died 1825), Archdeacon of Hereford John Lilly (writer) (c. 1553–1606), English writer
See also John Lilley (disambiguation) John Lillie (disambiguation)