Josef Loos (March 13, 1888 – February 15, 1955) was a Bohemian/Czechoslovak hockey player. Internationally, he played for the Bohemian National Team at the 1914 European Championship and the Czechoslovak National Team at the 1920 Summer Olympics hockey tournament (was a reserve there). At the club level, Loos played for SK Slavia Praha. After the end of his career in the 1920s, Loos served as an administrator for Slavia. He later served as president of the Czechoslovak Ice Hockey Association from 1946-1948. His younger brother, Villem Loos, was also an accomplished hockey player.