Maurice William Mantha Jr. (born January 21, 1961) is an American former professional ice hockey defenseman and who played twelve seasons in the National Hockey League (NHL) with the Winnipeg Jets, Pittsburgh Penguins, Edmonton Oilers, Minnesota North Stars, and Philadelphia Flyers.

He was subsequently raised in Canada, when his father retired from hockey and returned to his hometown of Sturgeon Falls, Ontario.

Mantha first played for the Toronto Marlboros of the Ontario Hockey Association in 1978, and was drafted by the NHL's Winnipeg Jets in 1980.

In 2005, Mantha was named as the head coach of the Detroit Gladiators of the new World Hockey Association, but the league never made it to the ice; instead, he served as head coach and general manager of the Windsor Spitfires of the Ontario Hockey League (OHL) until he was terminated for gross misconduct during the Akim Aliu/Steve Downie hazing scandal that ultimately resulted in the Spitfires being fined $35,000 under Mantha's tenure.

In 2017, he was hired as the head coach and general manager of the Brookings Blizzard in the North American Hockey League.