Hayrettin may refer to:
People Hayreddin Barbarossa (ca. 1478 – 1546), Turkish privateer and Ottoman admiral Hayrettin Yerlikaya (born 1981), Turkish footballer Hakan Hayrettin (born 1970), Turkish/English footballer Hayrettin Karaoğuz (born 1984) or just Hayrettin, Turkish comedian.
Places Sancaktar Hayrettin Mosque, Mosque in Istanbul Gölcük Barbaros Hayrettin Lisesi, public high school in Gölcük, Kocaeli, Turkey Kheïr Eddine, a town in Mostaganem Province, Algeria. Hayredin, a village in Bulgaria
See also Khair ad-Din (disambiguation) Hajrudin