King of Spain mainly refers to:
- The monarchy of Spain, headed by the King or Queen of Spain
- Felipe VI, current King of Spain
- The full list of Spanish monarchs
It may also refer to:
- "King of Spain", a song by the Canadian band Moxy Früvous
- "King of Spain", a song by the American indie rock band Galaxie 500
- "King of Spain", a song by Swedish indie folk artist The Tallest Man On Earth
- Future Kings of Spain, an Irish rock band
- Raoul and the Kings of Spain, an album by the English band Tears for Fears
- A nickname for Ashley Giles, an English cricketer