Leon Keer (born 1980, Utrecht, Netherlands) is a Dutch pop-surrealist artist. He has created work on canvas and (3D) artwork on the streets across the world. Leon Keer is a leading artist in anamorphic street art. His art has been showcased in Europe, the United States, Russia, Mexico, the United Arab Emirates, Australia, New Zealand, and several Asian countries. In addition to using optical illusion, he often presents his art by adding new technologies, such as augmented reality and video mapping. The art is temporary, but the images are shared all over the world via social media.

Leon generally paints contemporary themes which involve environmental concerns and raises questions about livability in this world.