Gustav Felix Flatow (January 7, 1875 – January 29, 1945) was a German gymnast. He competed at the 1896 Summer Olympics in Athens and at the 1900 Summer Olympics in Paris.Flatow was Jewish, and was born in Berent, West Prussia. In 1892, he moved to Berlin.Flatow competed in the parallel bars, horizontal bar, vault, pommel horse, and rings individual events. He won no medals, unlike his cousin and teammate Alfred Flatow.