John McCarthy
John McCarthy may refer to:
Government
- John George MacCarthy, Member of Parliament for Mallow constituency, 1874–1880
- John McCarthy (Irish politician), Member of Parliament for the Mid Tipperary constituency, 1892–1893
- John H. McCarthy, U.S. Representative from New York
- John McCarthy (Nebraska politician), Nebraska Republican politician
- John F. McCarthy, California Republican senator
- John J. McCarthy (New Jersey politician), New Jersey General Assembly member
- John V. McCarthy, member of the Ohio House of Representatives
- John Thomas McCarthy, U.S. ambassador
- John McCarthy (Australian diplomat), Australian ambassador to Vietnam, Mexico, Thailand, the United States, Indonesia, India and Japan
- John A. McCarthy, Australian ambassador to the Holy See
- John Keith McCarthy, Australian public servant in the Territory of Papua and New Guinea
Humanities and science
- John McCarthy (computer scientist), American computer scientist
- John McCarthy (linguist), American phonologist
- John D. McCarthy, American sociologist
- John McCarthy (mathematician), mathematician
- John F. McCarthy Jr., American scientist and engineer
Sports
- John McCarthy (American football), American football player
- John McCarthy (referee), mixed martial arts referee
- Johnny McCarthy, American basketball player and coach
- Johnny McCarthy (baseball), American baseball player
- John McCarthy (Gaelic footballer), Dublin Gaelic footballer
- John McCarthy (Kerry Gaelic footballer), who played in the 1964 All-Ireland Senior Football Championship final
- John McCarthy (ice hockey), American ice hockey player and coach
- John McCarthy (discus thrower), Paralympic athlete from Ireland
- John McCarthy (soccer), American soccer player
- John McCarthy (Australian rules footballer, born 1967), player with Fitzroy and North Melbourne
- John McCarthy (Australian rules footballer, born 1989), Port Adelaide and Collingwood player
- John McCarthy (sprinter), American sprinter, 1934 All-American for the USC Trojans track and field team
Religious states
- John E. McCarthy, Roman Catholic bishop of the Diocese of Austin
- John McCarthy (Irish bishop), bishop of Cloyne
- John McCarthy (Australian bishop), bishop of Sandhurst in Victoria, Australia
- John McCarthy (priest), Dean of Clogher, 1989–1994
- John Joseph McCarthy, Irish-born bishop to Nairobi, Kenya
Musicians
- John McCarthy (guitarist), guitarist
- John McCarthy (composer), Canadian composer
- John McCarthy (conductor), conductor of choral music
Others
- John McCarthy (journalist), British hostage and journalist
- John McCarthy Jr., Oscar-nominated set decorator
- John Edward McCarthy, American radio personality
- John P. McCarthy, American director and screenwriter