Robert Horn
Robert Horn (or variants) may refer to:
- Robert Horn (water polo) (1931–2019), American water polo player
 - Robert Horn (writer), American playwright and screenwriter
 - Robert E. Horn (born 1933), American political scientist and professor
 - Robbie Horn (born 1977), Scottish footballer
 - Bob Horn (broadcaster) (1916–1966), radio and TV presenter
 - Bob Horn (American football) (born 1954), National Football League linebacker