The 1970 Stanley Cup Finals was the championship series of the National Hockey League's (NHL) 196970 season, and the culmination of the 1970 Stanley Cup playoffs.

It was a contest between the Boston Bruins and the St. Louis Blues, who appeared in their third consecutive finals series. The Bruins were making their first appearance in the Stanley Cup Finals since 1958.

The Bruins won the series, four games to none. It was Boston's first Stanley Cup victory in 29 years. Bobby Orr scored the Cup-winning goal on Mother's Day against St. Louis' veteran Hall of Fame goalie Glenn Hall, with an assist from close friend and teammate "The Turk" Derek Sanderson, at forty seconds of overtime. The subsequent image of Orr flying through the air, his arms stretched out in victory (he had been tripped by Blues' defenseman Noel Picard immediately after scoring the goal) is considered the most famous and recognized hockey image of all time. With the win, the Bruins became the first American team to win the Stanley Cup since the Chicago Black Hawks in 1961. The Blues, who had gone to the Finals their first three years in the league, would eventually lose each of the three series in four-game sweeps. St. Louis would not appear in a Stanley Cup Finals again until 2019, where they also faced the Bruins, ending the second-longest Finals drought in league history.

Robert Gordon Orr (born March 20, 1948) is a Canadian former professional ice hockey player, widely acknowledged as one of the greatest of all time. Orr used his ice skating speed, scoring, and play-making abilities to revolutionize the position of defenceman. He played in the National Hockey League (NHL) for 12 seasons, the first 10 with the Boston Bruins, followed by two with the Chicago Black Hawks. Orr remains the only defenceman to have won the league scoring title with two Art Ross Trophies. He holds the record for most points and assists in a single season by a defenceman. Orr won a record eight consecutive Norris Trophies as the NHL's best defenceman and three consecutive Hart Trophies as the league's most valuable player (MVP). Orr was inducted into the Hockey Hall of Fame in 1979 at age 31, the youngest to be inducted at that time. In 2017 Orr was named by the National Hockey League as one of the "100 Greatest NHL Players" in history. After his hockey career, he became a well-known scout for many professional teams. He also spends time talking to and mentoring young skaters.

Orr started in organized hockey at age eight. He first played as a forward, but moved to defense and was encouraged to use his skating skills to control play. Orr's play in Ontario provincial competition attracted the notice of NHL scouts as early as age twelve. At fourteen, Orr joined the Oshawa Generals, the Bruins' junior hockey affiliate, and he was an all-star for three of his four seasons.

In 1966, Orr joined the Boston Bruins, a team that had not won a Stanley Cup since 1941 and had not qualified for the playoffs since 1959. With Orr, the Bruins won the Stanley Cup twice, in 1970 and 1972, and lost in the 1974 Final. In both victories, Orr scored the clinching goal and was named the playoff MVP. In the final achievement of his career, he was the MVP of the 1976 Canada Cup international hockey tournament. In 1976, Orr left Boston as a free agent to join the Black Hawks, but repeated injuries had effectively destroyed his left knee, and he retired in 1978 at age 30.

Orr's first professional contract was one of the first in professional ice hockey to be negotiated by an agent. It made him the highest-paid player in NHL history as a rookie. His second contract was the first million-dollar contract in the NHL. However, after his retirement, Orr learned he was deeply in debt and he had to sell off most of what he owned. Orr broke with his agent Alan Eagleson and sued the Black Hawks to settle his contract. Orr and his family returned to Boston where Orr went into business to rebuild his finances. Orr aided the investigations that led to Eagleson's fraud convictions and disbarment. Orr also supported a lawsuit that challenged the NHL over its control of its pension plan.

Orr entered the player agent business in 1996 and was the president of the Orr Hockey Group agency, until its acquisition by the Wasserman Media Group in 2018. Orr is also active in charitable works and in television commercials. Since 1996, Orr has coached a team of junior hockey players in the annual CHL Top Prospects Game.