Karel Walzer (born August 28, 1888) was a Bohemian/Czechoslovak goaltender. He played for the Bohemian National Team at the European Championships in 1912 and 1914, as well as at the 1914 LIHG Championship. Walzer was later a member of the Czechoslovak National Team at the 1920 Summer Olympics hockey tournament and the 1921 European Championship. He played club hockey with ČSS Praha. Walzer was employed as a banker.