William Leonard Edge FRSE (8 November 1904 – 27 September 1997) was a British mathematician most known for his work in finite geometry.
Edge made a "systematic classification of the quintic and sextic ruled surfaces of three-dimensional projective space.
An anachronism, Edge never drove a motor car and disdained the mass-media of radio and television; he was distressed by the decline of school geometry.
His proposers were Sir Edmund Taylor Whittaker, Herbert Westren Turnbull, Edward Thomas Copson and David Gibb.
A lifelong bachelor and devout Roman Catholic, Edge spent his final years in the care of the Sisters of Nazareth House in Bonnyrigg, just south of Edinburgh, and died there on 27 September 1997.