Sydney Curnow Vosper RWS, RWA was an English painter and etcher of landscapes and figure subjects. His later work has a close association with Wales and Brittany. His most famous work is Salem (1908), which shows an old woman in the Welsh national costume, with Welsh hat and shawl, attending a service at Salem Baptist Chapel, Pentre Gwynfryn.

Salem is a painting of 1908 by the English painter Sydney Curnow Vosper, depicting a scene within Capel Salem, a Baptist chapel in Pentre Gwynfryn, Gwynedd, Wales. It is noteworthy as a depiction of Welsh piety, the traditional Welsh national costume, and for a contentious belief that the devil is depicted within it. Mass reproductions throughout the early and mid 20th century ensured that the image became famous throughout Britain.