Stanley William Hayter (27 December 1901 – 4 May 1988) was an English 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 who frequented the atelier were Pablo Picasso, Alberto Giacometti, Joan Miró, Alexander Calder, Marc Chagall, Nemesio Antúnez, Jackson Pollock, Mark Rothko, Wassily Kandinsky, Mauricio Lasansky, K.R.H. Sonderborg, Flora Blanc and Catherine Yarrow.
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).
Hayter was equally active as a painter, "Hayter, working always with maximum flexibility in painting, drawing, engraving, collage and low relief has invented some of the most central and significant images of this century before most of the other artists of his generation", wrote Bryan Robertson.