William Webster (May 1819 - 1 February 1888) was an English builder who worked with architects and engineers such as Gilbert Scott and Joseph Bazalgette and is especially associated with several embankments of the River Thames. Between 1856 and 1857, Webster was commissioned to build the Cambridge Lunatic Asylum at Fulbourn. Following the completion of this project his next was the building of the Three Counties Asylum, near Hitchin.