Otto Froitzheim (24 April 1884 29 October 1962) was a German tennis player. At the 1908 Summer Olympics he won a silver medal in the men's singles tournament. Froitzheim, who was born in Strasbourg, Alsace, German Empire won the International German Championship seven times (1909-1911, 1921-1922 and again in 1925). In 1912 he won the World Hard Court Championships (Clay). In 1914, he and Oskar Kreuzer were members of the German International Lawn Tennis Challenge team, playing an International Lawn Tennis Challenge semifinal in Pittsburgh against Australasia. World War One was declared in the middle of the match, but those monitoring the telegraph did not want to disrupt the match.