Mary Henry (March 19, 1913 – May 20, 2009), born Mary M. Dill, was an American artist whose work, most notably large oil paintings and acrylics but also prints, was characteristized by geometric abstraction. Many of her pieces are diptychs and some are triptychs. Some of her work resembles, variously, op art, constructivism, or even psychedelic art.