Grzegorz Kosok (born 2 March 1986) is a Polish volleyball player, a member of Poland men's national volleyball team and Polish club Asseco Resovia, a participant of the Olympic Games London 2012, gold medalist of the FIVB World League 2012 and bronze medalist of the European Championship 2011 and the World League 2011, double Polish Champion (2012, 2013).