Sadettin

Sadettin is the Turkish version of the Muslim name Sa'd al-Din. It may refer to:
 * Sadettin Erbil (1925–1997), Turkish actor
 * Sadettin Ergeç, Iraqi Turkmen politician
 * Sadettin Heper (1899–1980), Turkish composer
 * Sadettin Kaynak (1895–1961), Turkish composer