Juan Carlos I of Spain (born 1938) is a former king of Spain.
Juan Carlos may also refer to:
- Juan Carlos (footballer, born 1945) (1945–2012), Spanish footballer
- Juan Domecq or Juan Carlos (born 1950), Cuban basketball player
- Juan Carlos (footballer, born 1956), Spanish footballer
- Juan Carlos (footballer, born 1965), Spanish footballer and manager
- Juan Carlos (weightlifter) (born 1965), Spanish Olympic weightlifter
- Juan Carlos (footballer, born 1973), Spanish footballer
- Juan Belencoso or Juan Carlos (born 1981), Spanish footballer
- Juan Carlos (footballer, born 1987), Spanish footballer
- Jake Cuenca or Juan Carlos (born 1987), American-Filipino actor and footballer
- Juan Carlos (footballer, born 1988), Spanish footballer
- Juan Carlos (footballer, born 1990), Spanish footballer
- Spanish amphibious assault ship Juan Carlos I
- Juan Carlos I Antarctic Base
- Juan Carlos I Park, a Madrid park