John McCarthy may be:

Government:

• John McCarthy (Nebraska) (1857-1943), American politician
• John McCarthy (soldier) (born 1943), American
• John McCarthy (ambassador), Australian

Science:

• John McCarthy (computer scientist) (born 1927), American
• John McCarthy (linguist) (born 1953), American phonologist
• John McCarthy (sociologist), American

Sports:

• 'Big' John McCarthy (fl. 2000s), fight referee
• John McCarthy (footballer), Welsh-born - Australian rules

Misc. people:

• John McCarthy (journalist) (born 1956), British
• John McCarthy (bishop) (1815-1893), Irish

John McCarthy | John McCarthy | John McCarthy | ジョン・マッカーシー | Џон Мекарти