Petar Cupać (born 1 February 1980) is a Croatian sailor. He competed at the 2008 and 2012 Summer Olympics in the 49er class.
Together with his teammates Pavle Kostov and Ivan Bulaja, he is a recipient of the International Fair Play Committee's Pierre de Coubertin World Trophy.[1] In the 2008 Summer Olympics they lent their boat to Danes Jonas Warrer and Martin Kirketerp whose mast had broken shortly before the start of their race.[2] [3] Warrer and Kirketerp went on to win a gold medal.