Louise Otto (August 30, 1896 – March 9, 1975) was a German freestyle swimmer, who competed in the 1912 Summer Olympics. She was born in Hamburg, Germany. She won a silver medal in the relay together with her teammates Grete Rosenberg, Wally Dressel and Hermine Stindt. Additionally, in the Women's 100 metre freestyle, she competed and was eliminated in the semi-finals.