William Keiller (4 July 1861 – 22 February 1931) was a Scottish born anatomist who trained in anatomy at the Edinburgh Extramural School of Medicine and was appointed as the first Professor of Anatomy at the University of Texas Medical Branch (UTMB) at Galveston, a post he held for 40 years. He served as Dean of the UTMB Medical School and as President of the Texas Medical Association. Many of his anatomical drawings and paintings are preserved and displayed at the Blocker History of Medicine collection at UTMB Moody Medical Library.