Mel Brock (George Melville Brock; February 3, 1888 – October 4, 1956) was a Canadian track and field athlete who competed in the 1912 Summer Olympics.
In 1912 he finished forth in the 800 metres competition. In the 400 metres event he was eliminated in the first round.
He was also a member of the Canadian relay team which was eliminated in the first round of the 4x400 metre relay event.