1970 in sports describes the year's events in world sport.
- 11 January – Super Bowl IV: the Kansas City Chiefs (AFL) won 23–7 over the Minnesota Vikings (NFL)
- Cotton Bowl (1969 season):
- 16 June – death of Brian Piccolo, Chicago Bears player
- 15 August – Patricia Palinkas becomes the first woman to play in a professional football game for the Orlando Panthers in the Atlantic Coast Football League.
- 3 September – death of Vince Lombardi, Green Bay Packers coach; subsequently, his name is given to the Super Bowl trophy and the Rotary Lombardi Award
- 2 October – The Wichita State University football team plane crash claims approximately half the football team when one of two planes crashes on the way to a game at Utah State University.
- 14 November – A plane carrying most of the Marshall University team crashes just short of landing near Huntington, West Virginia, killing all 75 aboard, including 37 players.
- 16 January – Gold Glove outfielder Curt Flood files a civil lawsuit challenging baseball's reserve clause, a suit that will have historic implications. Flood refused to report to the Phillies after he was traded by the Cardinals, contending the baseball rule violates federal antitrust laws.
- 17 January – The Sporting News names Willie Mays as Player of the Decade for the 1960s.
- 20 January – Lou Boudreau is elected to the Hall of Fame, receiving 232 of a possible 300 votes from the BBWAA.
- 7 April – The Milwaukee Brewers play their first ever game as the Brewers at Milwaukee County Stadium, after the team had relocated from Seattle.
- 12 June – Dock Ellis of the Pittsburgh Pirates throws a no-hitter against the San Diego Padres. It is later revealed that he did so while under the influence of LSD.
- Robert W. Peterson's book Only the Ball was White is published. The book brings pressure on Major League Baseball to recognize the African-American players from Negro league baseball by honoring its stars in the Baseball Hall of Fame.
- World Series – The American League's Baltimore Orioles win their second World Title by defeating the National League's Cincinnati Reds, 4 games to 1.
- NCAA Men's Division I Basketball Championship –
- National Basketball Association –
- 1970 ABA Finals –
- FIBA World Championship –
- Yugoslavia World Champion
- 6 January – Australia commences a controversial tour of South Africa.
- 4 March – South Africa completes a 4–0 series whitewash over Australia at Port Elizabeth. This was to be South Africa's last Test match for 22 years.
- 22 May – The British Government forces England to cancel the planned tour of England by South Africa.
- A "Rest of the World" team captained by Garry Sobers plays five unofficial Test matches against England winning the series 4–1.
- In their centenary year Kent wins the English County Championship for the first time since 1913.
- The International Cricket Conference votes to suspend South Africa from international cricket indefinitely because of its government's apartheid policy.
- Men's European Nations Cup held in Brussels and won by West Germany
- Masters Tournament – Billy Casper
- U.S. Open – Tony Jacklin
- British Open – Jack Nicklaus
- PGA Championship – Dave Stockton
- PGA Tour money leader – Lee Trevino – $157,037
- Fresh Yankee was named "Horse of the Year" by the U.S. Trotting Association and the U.S. Harness Writers Association.
- Most Happy Fella won the United States Pacing Triple Crown races –
- United States Trotting Triple Crown races –
- Australian Inter Dominion Harness Racing Championship –
- Pacers: Bold David
- Australia – Melbourne Cup won by Baghdad Note
- Canada – Queen's Plate won by Almoner
- France – Prix de l'Arc de Triomphe won by Sassafras
- Ireland – Irish Derby Stakes won by Nijinsky
- English Triple Crown Races:
- United States Triple Crown Races:
- Art Ross Trophy – Bobby Orr becomes the first defenseman in the history of the National Hockey League to lead the league in scoring.
- Hart Memorial Trophy for the NHL's Most Valuable Player: Bobby Orr, Boston Bruins
- Stanley Cup – Boston Bruins win the Cup for the first time in 29 years, defeating the St. Louis Blues four games to none. Defenseman, Bobby Orr is awarded the Conn Smythe Trophy as the series MVP (most valuable player).
- World Hockey Championship
- Men's champion: Soviet Union defeated Sweden
- NCAA Men's Ice Hockey Championship – Cornell University Big Red defeat Clarkson University Golden Knights 6–4 in Lake Placid, New York; only NCAA hockey team to complete season undefeated and untied (31–0)
- 15 March – the final match of the 1969–70 European Championship is played, with England crowned champions for finishing on top of the league
- 19 September – the 1970 NSWRFL season culminates with South Sydney's 23–12 Grand Final victory over Manly-Warringah
- 8 November – the 1970 World Cup is won by Australia, who defeated Great Britain 12–7 in the final
- Grand Slam in tennis men's results:
- Margaret Court wins the Grand Slam in women's tennis –
- Davis Cup – United States wins 5–0 over Germany F.R. in world tennis.
- 1970 FIVB Men's World Championship held in Sofia and won by East Germany
- Mullen, Brigid (21 April 2006). "The Love of the Game: Football is not just a sport for guys; girls embrace it too". Sports Illustrated.
- "Epsom Derby | History, Winners, & Facts | Britannica". www.britannica.com. Retrieved 3 January 2022.
- "Our Games | Commonwealth Games Federation". thecgf.com. Archived from the original on 4 January 2022. Retrieved 4 January 2022.