William Wilfred Campbell was born 15 June 1860 in Newmarket, Upper Canada (present-day Ontario). There is some doubt as to the date and place of his birth. His father, Rev. Thomas Swainston Campbell, was an Anglican clergyman who had been assigned the task of setting up several frontier parishes in "Canada West", as Ontario was then called. Consequently, the family moved frequently.
In 1871, the Campbells settled in Wiarton, Ontario, where Wilfred grew up, attending high school in nearby Owen Sound. The school later be renamed Owen Sound Collegiate and Vocational Institute). Campbell would look back on his childhood with fondness.