John or Johnny Power may refer to:
Politics and government
- John Power (Irish MP), Member of Parliament for County Waterford and Dungarvon
- John Power (Patriot Parliament MP), Member of Irish Parliament for Charleville
- John Joseph Power (1867–1968), Australian politician
- John O'Connor Power (1846–1919), Irish Fenian
- Sir John Power, 1st Baronet (1874–1945), British Member of Parliament for Wimbledon
- Sir John Power, 3rd Baronet, Member of Parliament for County Wexford
Sports
- Johnny Power (1874–?), Australian rules footballer
- John T. Power (1883–1982), Irish hurler
- John Power (cricketer) (1932-2005), an Australian cricketer
- John Power (hurler) (born 1966), former Irish sportsperson
- John A. Power (born 1976), rugby league player
Arts and entertainment
- John Power (musician) (born 1967), English singer-songwriter and musician
- John Joseph Wardell Power (1881–1943), Australian modernist artist
- John Power (director) (1930-2016), Australian television and film director