Samuel Clay Johnson (July 1881 – unknown) was an English footballer. His regular position was as a forward. Born in Manchester, he began his career with , but moved to Newton Heath in January 1901. He made his only league appearance on 20 March 1901, playing at inside right in a 3–2 home defeat by Leicester Fosse. He moved to Barnsley for the 1901–02 season, but did not make a single appearance before moving on to Heywood in November 1902.