Rudolf Karl Anton Tomaschek (23 December 1895 in Budweis, Bohemia – 8 February 1966, Breitbrunn am Chiemsee) was a German experimental physicist. His scientific efforts included work on phosphorescence, fluorescence, and (tidal) gravitation. Tomaschek was a supporter of deutsche Physik, which resulted in his suspension from his university posts after World War II. From 1948 to 1954, he worked in England for the Anglo-Iranian Oil Company (AIOC). In 1954, when AIOC became BP, he went to Germany and was president of the Permanent Tidal Commission.