William Sawney Bisat, FRS (1886-1973) was a civil engineer in the north of England whose principal recreation was geological research.
He is remembered for his work on goniatites which contributed to the refinement of the stratigraphy of the Carboniferous period, not least in northern England.
Bisat was born in Doncaster, West Riding of Yorkshire on 19 October 1886 to Charles Edward and Margaret Bisat.
Amongst positions he held were president of Hull Geological Society (1927–28), of Leeds Geological Association (1934–35) and of the Yorkshire Naturalists' Union (1935).
He was presented with the Lyell Medal by the Geological Society in 1942.