Ivan Cosic (born (1984-02-21)21 February 1984 in Livno) is a Croatian male volleyball player.
He spent most of his career with OK Mladost Marina Kaštela, with whom he won the 2011/12 and 2015/16 national championships.
He also played for French Cambrai and Romanian Arcada Galati between 2012 and 2015.
Cosic played with the Croatia men's national volleyball team between 2002 and 2017, participating in eight European Volleyball Championships with them.