John Kemp (1380–1454) was Archbishop of Canterbury and Lord Chancellor of England.
John Kemp or Johnny Kemp may also refer to:
Sports John Kemp (Australian footballer) (born 1944), Australian football player John Kemp (baseball), Negro league baseball player John Kemp (cricketer, born 1928), South African cricketer John Kemp (cricketer, born 1952), South African cricketer John Kemp (New Zealand footballer) (1940–1993), New Zealand international football (soccer) player
Others John Kemp, 1st Viscount Rochdale (1906–1993), British peer, soldier and businessman John Arthur Kemp (1926–1987), master mariner, author, educationalist St John Kemp, 2nd Viscount Rochdale (1938–2015) John Kemp (antiquary) (1665–1717), English collector John Kemp (mathematician) (1763–1812), Scots-born mathematician who moved to New York John Dan Kemp (born c. 1951), Chief Justice of Arkansas John D. Kemp (born 1949), American disability rights leader Jonathan Johnny Kemp (1959–2015), Bahamian singer, songwriter, and record producer