John Adams Griefen (b. Worcester, MA, 1942; d. Bergerac, France 2025) was an American artist and early Color Field painter who made important contributions to abstract art in the United States and in Europe. In his successful career as a painter he had seventeen solo exhibitions in New York City, the first at age 27. Foremost, Griefen is known for the essence of color in his paintings, and for many years, he made large, often monumental, acrylic paintings on canvas.