William Geissler
 William Hastie Geissler (1894 Edinburgh - 1963) was a Scottish artist known for his watercolours of the natural world. He was one of the Edinburgh School and much of his earlier work came from sketching trips undertaken with other members of this group though he himself is sometimes described as a neglected member. Geissler and William Gillies both graduated from Edinburgh College of Art in 1922 having won scholarships and exhibited for several years with colleagues as The 1922 Group.