Look up JFK in Wiktionary, the free dictionary.

John F. Kennedy (1917–1963) was the president of the United States from 1961 to 1963.

Jack Kennedy may also refer to:

• Jack Kennedy (footballer, born 1873), Scottish international football player
• Jack Kennedy (footballer, born 1906), English football player
• Jack Kennedy (hurler), Irish forward
• Jack Kennedy (jockey) (born 1999), Irish jockey
• Jack Kennedy (train robber) (c. 1870–1922), American outlaw
• Uncle Jack Kennedy (1919–2005), activist and spokesman for Australian Aboriginal rights
• Kennedy (musician), American nu-disco musician and former member of the Silversun Pickups