Percy Sinclair Pilcher (16 January 1867 – 2 October 1899) was a British inventor and pioneer aviator who was his country's foremost experimenter in unpowered flight near the end of the nineteenth century. After corresponding with Otto Lilienthal, Pilcher had considerable success with developing hang gliders. in 1895 he made repeated flights in the Bat, and in 1896–1897 many flights in the Hawk culminated in a world distance record.