The Penwith Society of Arts is an art group formed in St Ives, Cornwall, England, UK, in early 1949 by abstract artists who broke away from the more conservative St Ives School. It was originally led by Barbara Hepworth and Ben Nicholson, and included members of the Crypt Group of the St Ives Society, including Peter Lanyon and Sven Berlin. Other early members included: Leonard Fuller, Alexander Mackenzie, John Wells, Bryan Wynter, Wilhelmina Barns-Graham, David Haughton, Denis Mitchell, and the printer Guido Morris. Herbert Read was invited to be the first president.
The group bought fishing lofts along Porthmeor beach to use as artists' studios.
The current full members are: