Constantine Koukias (born 14 October 1965) is a Tasmanian composer and opera director of Greek ancestry based in Amsterdam, where he is known by his Greek name of Konstantin Koukias. He is the co-founder and artistic director of IHOS Music Theatre and Opera, which was established in 1990 in Tasmania's capital city, Hobart. Prayer Bells, in which the composer draws on traditions of Latin, Hebrew and Byzantine chant, had its US premiere in 2010 at the Chicago Cultural Center. In 2014, Kimisis – Falling Asleep had its Netherlands premiere at Splendor Amsterdam and toured to the Karavaan Festival.