John Petty may refer to:
John Petty (priest) (1935–2017), Anglican provost and Dean of Coventry John Petty (Primitive Methodist minister) (1807–1868), 19th-century author and Primitive Methodist minister and first governor of Elmfield College John Petty, 1st Earl of Shelburne (1706–1761), politician, father to former prime minister of Great Britain, William Petty, 2nd Earl of Shelburne John Petty, 2nd Marquess of Lansdowne (1765–1809), son of former prime minister of Great Britain, William Petty, 1st Marquess of Lansdowne John Petty Jr., (born 1998), American basketball player John Petty (American football), American football player
See also John Pettie, Scottish painter