Galin Kostadinov (; born December 24, 1979 in Dobrich) is a retired Bulgarian shot putter. He represented his nation Bulgaria, as a 35-year-old, in the shot put at the 2004 Summer Olympics, and also trained as a member of the athletics squad for the sport club Dobrudzha in his native Dobrich under his coach and mentor Ivan Petrov. In 2006, Kostadinov threw a personal best of 20.10 metres to seal the twenty-fifth spot in men's shot put at the European Championships in Gothenburg, Sweden.