Harry Sadler was born in Belfast, Northern Ireland. Harry was a resident of Toronto.
Harry was a referee in the National Soccer League in the 1950’s.
In 1955 he was the referee in the Canadian Soccer Championship match between Montreal Ukraina and New Westminster Royals.
On June 22, 1957 he refereed the World Cup qualifying match between Canada and the United States at Varsity Stadium in Toronto. Canada won 5-1 over the United States.
On May 16, 1963 he was the referee in the exhibition game between New York Hungaria and the Mexican National Team in New York.
In 1961 he was the referee of the Canadian National Championship final between Montreal Concordia and Vancouver Firefighters.
From 1961 until 1966 he was a referee in the Eastern Canada Professional Soccer League.
Harry was one of three Canadian referees to hold official refereeing badges from FIFA. The two others were Dan Kulai and Ray Morgan.
In 1967 he was a referee at the Expo Soccer International Tournament in Toronto. On June 8 he refereed the match between Russia and Germany.
Harry was a referee in the United Soccer Association in 1967 and in the North American Soccer League in 1968.
In February 1968 he was named as head referee of the Canadian Soccer Football Association.
On May 11, 1970 he was the referee in the exhibition game between Manchester United and Glasgow Celtic at Varsity Stadium. A crowd of 24,466 watched Manchester United win 2-0.
Ed Waring, The Globe and Mail, Toronto, May 17 1963