Circle: International Survey of Constructivist Art was an almost 300-page art book published in London, England, in 1937. It was edited by the artists Ben Nicholson and Naum Gabo and the architect Leslie Martin with the layout being designed by Barbara Hepworth. Circle was intended to be a series of publications so is sometimes referred to as a journal or magazine, although only one issue was actually produced. Circle was reprinted in 1971 in the United States by Praeger Publishers and in the UK by Faber & Faber, in paperback.