The Hundred Acres gallery was an art gallery owned by Ivan Karp (1926-2012) located in New York City. Karp, known for his support of the Pop art movement, was director of the Castelli Gallery before opening Hundred Acres. He was also the owner of the O.K. Harris gallery that operated across the street from Hundred Acres gallery.
Hundred Acres gallery was in operation through most of the 1970s and represented contemporary artists including John Baeder, Shirley Pettibone, Liliana Porter, Mark Wilson, and numerous others. The gallery held group shows, the exhibition Judy and Adrienne - Two Lives (1973), and published Radical Realism I, a portfolio of lithographic prints by artists such as Richard Estes and Ralph Goings.