- Township: Embro & West Zorra
- Branch: 1st Depot Battalion, W.O.R.
- Regiment number: 3134268
- Date of birth: April 22, 1886
- Where born: Gadshill, Perth County, Ontario, Canada
- Wars Served: World War I
- Years of service: May 31, 1918 -
- Country enlisted with: Canada
Harry Clark was born April 22, 1886, in Gadshill in Perth County. When he enlisted on May 21, 1918, he was an unmarried farmer who gave his address as Harrington West. At the time, Harry’s father George and stepmother Margaret (Sutherland) were living on Lot 30, Concession 1.