William Harry Clarke (born 1880) was an English professional footballer who played as a full back for various clubs in the 1900s.
At Sheffield, Clarke was never a regular first-team player making only two appearances, with England international Harry Thickett being well established at right-back.
The "Saints" were anxious to regain the Southern League title which they had taken six times in the eight years up to 1904, but had finished in a disappointing third place at the end of the 1904–05 season.
He returned in mid-February but was only able to show glimpses of his previous form;[1] after another eight matches he suffered a serious knee injury, losing his place to Jack Eastham.
[3] Although Clarke spent several months trying to regain his fitness, he eventually retired in October 1908 without returning to the first-team.