Harold "Mum" Mummery (August 25, 1889 – December 9, 1945) was a Canadian professional ice hockey defenceman.
Mummery played professionally from 1911 until 1923, including six seasons in the National Hockey League for the Toronto Arenas, Quebec Bulldogs, Montreal Canadiens and Hamilton Tigers.
He was a three-time O'Brien Cup champion and a two-time winner of the Stanley Cup.
At the time of his career, Mummery was the largest player ever in the NHA and NHL, playing at 245 pounds in his NHL years and he was known to eat two steaks before hockey games.
Mummery appeared in three games as an NHL goaltender in an era when teams didn't dress a backup netminder, making him the skater to have played the most games in net.
He suited up as a goaltender twice with Quebec and once with Hamilton.