Oskar Karl Maria Zoth (28 August 1864, Padua – 30 November 1933, Graz) was an Austrian physiologist. In 1888 he received his medical doctorate from the University of Graz, where in 1896 he qualified as a lecturer for physiology. In 1898 he became an associate professor, and three years later, was a named a full professor at the University of Innsbruck. In 1904 he returned as a professor to the University of Graz. In 1900 he was a recipient of the Lieben Prize.