Gretta Sarfaty, born Alegre Sarfaty, is also known as Gretta Grzywacz and Greta Sarfaty Marchant, also simply as Gretta. is a painter, photographer and multimedia artist who earned international acclaim in the 1970s, from her artistic works related to Body art and Feminism. Born in Greece, in 1947, she moved with her family to São Paulo in 1954, being naturalized as Brazilian. Alongside her art she was the founder of the artist-run space, Sartorial Contemporary Art (2005–2010), and since 2010 she keeps an art collection called Alegre Sarfaty Collection.