Okan Demiriş (9 February 1942, in Istanbul – 18 June 2010) was a Turkish composer. He was married to the soprano Leyla Demiris.
His works include several operas:
IV. Murat (pronounced Dördüncü Murat) libretto: Turan Oflazoğlu three acts, based on the life of Murad IV.
1977-79 Karyağdı Hatun, libretto: Nezihe Araz in three acts
1982-83 Yusuf ile Züleyha, libretto: Nezihe Araz.