William Duff (6 February 1935 – 30 August 2004) was a Scottish professional footballer who played as a goalkeeper. Born in Winchburgh, West Lothian, Duff grew up in western Edinburgh, attending Corstorphine Primary School and Boroughmuir High School. He originally played as a left-back while with juvenile side Slateford Athletic but deputised in goal on one occasion when the side's regular custodian didn't turn up and retained the role afterwards. He caught the attention of Easthouses Lily with his performances in his new position and worked as a joiner while playing for them in the East of Scotland League.