Horst Heinz Köhler (born 15 February 1963), known professionally as Guildo Horn (German pronunciation: [ˈɡɪldo ˈhɔʁn]), is a German Schlager singer. He is best known for his eccentric stage persona, which includes outrageous clothes and extroverted antics.

At the Eurovision Song Contest 1998, he came seventh with the song "Guildo hat euch lieb!" ("Guildo loves you!").