William Bulloch FRS (19 August 1868, in Aberdeen – 11 February 1941) was a British bacteriologist and historian of bacteriology. After education at Old Aberdeen Grammar School (the 'Barn'), Bulloch in 1884 matriculated at the University of Aberdeen and graduated there M.B., M.Chir. in 1890. In 1890–1891 he worked as an assistant in a medical practice, but then returned to the University of Aberdeen in 1891 and worked under David James Hamilton on the pathology of the mammalian nervous system. Bulloch did post-graduate work at the University of Leipzig as a voluntary assistant to Birch-Hirschfeld and also studied at Vienna. In 1894 he returned briefly to the University of Aberdeen and received the higher medical qualification Doctor of Medicine. In 1894 he became an assistant to David Ferri