John Hewgill Brockelbank (June 24, 1897 - May 30, 1977) was a politician in Saskatchewan, Canada, who served as leader of the opposition in the Legislative Assembly of Saskatchewan. Born in Grey County, Ontario, Brockebank moved to Saskatchewan with his parents in 1911 to a homestead near North Battleford. After returning from service in World War I he established his own farm near Bjorkdale in northeastern Saskatchewan. In 1962 Douglas' successor as Premier, Woodrow Lloyd, appointed Brockelbank to the position of Provincial Treasurer and Deputy Premier.