Sly or Slye is the surname of:
People: Allan Sly (born 1951), sculptor Allan Sly (mathematician), probability theorist and MacArthur Fellow Darryl Sly (1939–2007), Canadian National Hockey League player Damon Slye (born 1962), computer game designer, director and programmer Harold Sly (1904–1996), English professional association football player James Calvin Sly (1807–1864), Mormon pioneer, scout, settler and missionary Leonard Slye, birth name of Roy Rogers (1911–1998), America singer and actor Maud Slye (1879–1954), American pathologist Philippe Sly, Canadian singer Richard Meares Sly (1849–1929), Australian judge Tony Sly (1970–2012), American singer, songwriter and guitarist, best known as the frontman of the punk rock band No Use for a Name William Sly (died 1608), Elizabethan actor and colleague of William Shakespeare William S. Sly (1932–2025), American physician and scientist
Fictional characters: Christopher Sly, in Shakespeare's play The Taming of the Shrew