Stanley William Hayter (December 27, 1901 – May 4, 1988) was a British painter and printmaker associated in the 1930s with Surrealism and from 1940 onward with Abstract Expressionism. Regarded as one of the most significant printmakers of the 20th century, in 1927 Hayter founded the legendary Atelier 17 studio in Paris. Since his death in 1988, it has been known as Atelier Contrepoint. Among the artists Hayter was credited with influencing were Pablo Picasso, Alberto Giacometti, Joan Miró, Alexander Calder, Marc Chagall, Jackson Pollock, Mark Rothko, Mauricio Lasansky, K.R.H. Sonderborg, K.P. Brehmer and Tinca Stegovec.
He is noted for his innovative work in the development of viscosity printing (a process that exploits varying viscosities of oil-based inks to lay three or more colours on a single intaglio plate)