Anton Weichselbaum (8 February 1845 – 23 October 1920) was an Austrian pathologist and bacteriologist born near the town of Langenlois. Weichselbaum was among the first scientists to recognize the importance of bacteriology for the field of pathological anatomy.In 1869, he received his medical doctorate in Vienna, and subsequently worked as an assistant to pathological anatomist Josef Engel (1816–1899).