Felix Vladislavovich Ravdonikas (Russian: Фе́ликс Владисла́вович Равдоника́с), (February 22, 1937 in Leningrad – August 11, 2011 in Saint Petersburg), was a Russian organologist and musicologist, musician and composer, graphic artist, actor, mathematician, ethnographer, designer and craftsman specializing in flutes and other authentic musical instruments.