Kazys Varnelis (February 25, 1917 in Alsėdžiai – October 29, 2010 in Vilnius) was an abstract painter from Lithuania. He lived and worked in the United States of America for fifty years, between 1949 and 1998. His distinctive painting style demonstrated optical and three-dimensional illusions based on geometric abstractions and minimal forms. His style combined elements of constructivism, minimalism, and op art. His work is sometimes described as a modernist interpretation of Lithuanian folk art and is owned by Solomon R. Guggenheim Museum, the Art Institute of Chicago, Currier Museum of Art, and other museums. Varnelis was also an avid collector of antiques and bibliophile – his collection is now housed at the Kazys Varnelis House–Museum in Vilnius. His son, also named Kazys Varnelis is a noted architect, art historian, and theorist.