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1991 in sports describes the year's events in world sport.
- Super Bowl XXV – the New York Giants (NFC) won 20–19 over the Buffalo Bills (AFC)
- Thurman Thomas of the Buffalo Bills is named the NFL MVP
- Orange Bowl (1990 season):
- Desmond Howard, University of Michigan wide receiver seals the Heisman Trophy with a 93-yard punt return in Michigan's 31–3 hammering of Ohio State.
- World Bowl '91: London Monarchs won 21–0 over the Barcelona Dragons in the inaugural World Bowl.
- Quarterback Stan Gelbaugh of the London Monarchs is named the World League of American Football's inaugural seasons Most Valuable Player
Australian rules footballEdit
- Australian Football League
- The Adelaide Crows join the league
- 25 April – North Melbourne and Sydney kick between them 32.18 (210) in the first half. It is the record aggregate score for a half of VFL/AFL football.
- 2 June – Carlton kick their first goal with 33 second to go against Footscray, the closest a team has come to finishing goalless since Richmond kicked 0.8 (8) in 1961 against St. Kilda.
- 8 September – Hawthorn beat West Coast 18.16 (124) to 15.11 (101) in the first final outside Melbourne.
- 1991 AFL Grand Final (28 September) – Hawthorn wins the 95th AFL premiership beating West Coast 20.19 (139) to 13.8 (86) in the only Grand Final at VFL Park.
- Brownlow Medal awarded to Jim Stynes (Melbourne)
- 7 October – death of Darren Millane, who played for Collingwood between 1984 and 1991, from a car crash in Prahran.
- Dave Righetti breaks Sparky Lyle's major league record for left-handers of 238 career saves.
- 1 May – Nolan Ryan pitchers his seventh career no hitter with a 3–0 victory over the Toronto Blue Jays
- 28 July – Dennis Martínez of the Montreal Expos pitches the 13th perfect game in major league history, beating the Los Angeles Dodgers 2–0.
- World Series – The Minnesota Twins win 4 games to 3 over the Atlanta Braves. The series MVP is Jack Morris of Minnesota.
- Cal Ripken Jr. of the Baltimore Orioles is named AL MVP
- Terry Pendleton of the Atlanta Braves is named NL MVP
- Roger Clemens of the Boston Red Sox is named AL Cy Young award winner. It is his third of six in his career
- Tom Glavine of the Atlanta Braves is named NL Cy Young award winner
- Chuck Knoblauch of the Minnesota Twins is named AL Rookie of the Year
- Jeff Bagwell of the Houston Astros is named NL Rookie of the Year
- NCAA Men's Basketball Championship – Duke wins 72–65 over Kansas
- Larry Johnson of UNLV is named Naismith College Player of the Year
- 9 February – Dee Brown win the Gatorade Slam Dunk Contest
- 10 February – NBA All-Star Game is held in Charlotte, North Carolina
- 12 June – NBA Finals: Chicago Bulls win 4 games to 1 over the Los Angeles Lakers to earn the franchise's first championship, starting a run of six titles in eight seasons.
- Michael Jordan is named the NBA MVP, his second of 5 awards.
- 7 November – Lakers' superstar Magic Johnson announces he tested positive for the virus that causes AIDS, thus ending his career in the NBA.
- National Basketball League (Australia) Finals: Perth Wildcats defeated the Eastside Melbourne Spectres 2–1 in the best-of-three final series.
- 17 December – The Cleveland Cavaliers beat the Miami Heat 148 to 80, the largest margin of victory in any NBA game.
- 3 March – Mike Tyson defeats Donovan Ruddock in a seventh-round TKO
- 19 April – Evander Holyfield defeats George Foreman to retain WBC, WBA & IBF Heavyweight titles
- 7 to 12 May – 29th European Amateur Boxing Championships held in Gothenburg, Sweden
- 3 June – Thomas Hearns defeats Virgil Hill with a unanimous decision to win WBA Light Heavyweight title
- 1 June at Palm Springs, California – Terry Norris knocked out Donald Curry in the 8th Round to win the WBC Super Welterweight Championship.
- 28 June Mike Tyson defeats Donovan Ruddock in a rematch with a 12-round unanimous decision
- 2 to 18 August – Pan American Games held in Havana, Cuba.
- 5 October – James Toney defeats Michael Nunn with a TKO to win IBF Middleweight title
- James Toney is named Ring Magazine fighter of the year
- Iditarod Trail Sled Dog Race Champion –
- Rick Swenson won with lead dog: Goose
- Master – Ian Woosnam
- U.S. Open – Payne Stewart
- British Open – Ian Baker-Finch
- PGA Championship – John Daly
- PGA Tour money leader – Corey Pavin – $979,430
- Senior PGA Tour money leader – Mike Hill – $1,065,657
- Ryder Cup – United States team won 14½ – 13½ over the Europe in team golf.
- British Amateur – Gary Wolstenholme
- U.S. Amateur – Mitch Voges
- European Amateur – Jim Payne
- Tiger Woods, at age 15, won his first USGA title, the U.S. Junior Amateur.
- North America Cup – Precious Bunny
- United States Pacing Triple Crown races –
- United States Trotting Triple Crown races –
- Australian Inter Dominion Harness Racing Championship –
- Australia – Melbourne Cup won by Let's Elope
- Canadian Triple Crown Races:
- Queen's Plate – Dance Smartly
- Prince of Wales Stakes – Dance Smartly
- Breeders' Stakes – Dance Smartly
- Dance Smartly becomes the country's third consecutive Triple Crown winner.
- France – Prix de l'Arc de Triomphe won by Suave Dancer
- Ireland – Irish Derby Stakes won by Generous
- Japan – Japan Cup won by Golden Pheasant
- English Triple Crown Races:
- United States Triple Crown Races:
- Breeders' Cup World Thoroughbred Championships:
- Art Ross Trophy as the NHL's leading scorer during the regular season: Wayne Gretzky, Los Angeles Kings
- Hart Memorial Trophy for the NHL's Most Valuable Player: Brett Hull, St. Louis Blues
- Stanley Cup
- Conn Smythe Trophy – Mario Lemieux, Pittsburgh Penguins
- World Hockey Championship
- Sheffield Steelers formed
- San Jose Sharks formed
- Northern Michigan University wins the NCAA Division I title in hockey, 8–7 in the third overtime against Boston University.
- Penrith Panthers defeat two-time defending premiers Canberra Raiders in the New South Wales Rugby League Grand Final at the Sydney Football Stadium. It is Penrith's first premiership since their admission in 1967.
- Wigan retained their title in the English Rugby League competition, with Oldham, Sheffield Eagles and Rochdale Hornets being relegated. To date this is Rochdale's last appearance in the top flight.
- The sixth FINA World Championships, held in Perth, Australia (3 January – 13)
- Eleventh Pan American Games held in Havana, Cuba (12–18 August)
- 20th European LC Championships, held in Athens, Greece (18–25 August)
- Fourth Pan Pacific Championships, held in Edmonton, Alberta, Canada (22–25 August)
- First European Sprint Championships, held in Gelsenkirchen, Germany (6–8 December)
- 13 December – Steve Crocker sets the first official world record in the men's 50m freestyle (short course) in Sheffield, United Kingdom, clocking 25.64.
- 20 June – death of Michael Westphal (26), German player
- Grand Slam in tennis men's results:
- Grand Slam in tennis women's results:
- Davis Cup – France won 3–1 over the United States in world tennis.
- FIVB World League: Italy
- Asia Volleyball Championship: Japan
- Men's European Volleyball Championship: USSR
- Pan American Games: Cuba
- FINA Men's World Water Polo Championship: USA
- FINA Women's World Water Polo Championship: Netherlands
- Eleventh Pan American Games held in Havana, Cuba
- Fifth All-Africa Games held in Cairo, Egypt
- Eleventh Mediterranean Games held in Athens, Greece
- Sixteenth Summer Universiade held in Sheffield, United Kingdom
- Fifteenth Winter Universiade held in Sapporo, Japan
- Sixteenth Southeast Asian Games held in Manila, Philippines
- "USA Gymnastics Official Biography: Kim Zmeskal". usagym.org. Retrieved 12 January 2021.
- "Epsom Derby | History, Winners, & Facts | Britannica". www.britannica.com. Retrieved 4 January 2022.
- "FAQ: What are the Pan American Games?". Team Canada - Official Olympic Team Website. Retrieved 4 January 2022.