John Diamond Harkness MBE (27 September 1907 – 6 October 1985) was a Scottish international footballer, best remembered as the goalkeeper in the "Wembley Wizards" Scotland side of 1928.

A prime example of Hearts' unpredictability was season 1932–33, when both title holders Motherwell and eventual champions Rangers were defeated, yet points dropped to lesser sides ensured they only achieved a third-place finish.

McGrory, however, highlighted his gratitude for the goalkeeper's action and the following season in a game between the two clubs, the Celtic fans gave Harkness a prolonged ovation as he took up his position in goal.

After spending the remainder of the season as a reserve, Harkness decided to retire at the comparatively young age of 29, to pursue a career in sports journalism.

[8] An unfancied side, in which the entire forward line measured 5' 7" or less, recorded a resounding 5–1 triumph and earned the moniker "the Wembley Wizards".