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1984 in sports describes the year's events in world sport.
- Super Bowl XVIII – the Los Angeles Raiders (AFC) won 38–9 over the Washington Redskins (NFC)
- Walter Payton breaks Jim Brown's rushing record on October 7.
- Philadelphia Stars win United States Football League Championship, 23-3 over Arizona Wranglers
- Orange Bowl (1983 season):
- Doug Flutie wins the Heisman Trophy
- November 23 – The Hail Flutie Game
- 1984 college football season:
- European Championship – Final: France 2-0 Spain; Hosts: France
- Asian Cup – Final: Saudi Arabia 2 – 0 P.R. China; Hosts: Singapore
- Champions' Cup – – May 30 – Liverpool 1-1 A.S. Roma; Liverpool won 4-2 on penalties after extra time.
- UEFA Cup – Two legs; 1st leg Anderlecht 1-1 Tottenham Hotspur; 2nd leg Tottenham Hotspur 1-1 Anderlecht; 2-2 on aggregate, Spurs won 4-2 on penalties
- Cup Winners' Cup – Juventus 2-1 Porto
- Super Cup – Juventus 2-0 Liverpool
- Copa Libertadores de América – Two legs; 1st leg Grêmio 0-1 Independiente; 2nd leg Independiente 0-0 Grêmio; Independiente won 1-0 on aggregate
- England – FA Cup – – May 12 – Everton win 2-0 against Watford
- FIFA gives the right to host the 1990 FIFA World Cup to Italy
- The North American Soccer League folds due to financial problems
- Victorian Football League
- March 31: Carlton 31.13 (199) beat North Melbourne 9.8 (62) at VFL Park. This remains the largest opening round win in League history.
- July 28: On a waterlogged Western Oval, Footscray and Essendon play a goalless first half. It is the first time this has occurred since 1968 and only the second since 1899.
- Essendon wins the 88th VFL Premiership, defeating Hawthorn 14.21 (105) to 12.9 (81) in the Grand Final
- Brownlow Medal awarded to Peter Moore (Melbourne)
- West Australian Football League
- May 5: West Perth 15.15 (105) draw with South Fremantle 16.9 (105) at Leederville Oval for the first senior WAFL draw in 888 matches since East Fremantle and Swan Districts each scored 11.14 (80) at East Fremantle Oval on April 21 of 1974. This constitutes the second-longest non-occurrence of draws in a major Australian Rules competition; ironically the only longer one ended with a draw between the same two clubs at the same ground.
- Donald Sterling relocates the San Diego Clippers to Los Angeles.
- NCAA Men's Basketball Championship –
- NCAA Division I Women's Basketball Championship
- University of Southern California(USC) wins 72–61 over Tennessee
- NBA Finals –
- National Basketball League (Australia) Finals:
- Central Missouri State University won the NCAA Division II men's and women's basketball titles, becoming the first school ever in any division to accomplish the feat. The University of Connecticut would do the same in Division I in 2004.
- NBA Draft –
- March 31 – Wilfredo Gómez defeats Juan Laporte by a decision in 12 rounds to conquer the WBC's world Featherweight crown.
- June 15 – in the most anticipated bout of the year, Thomas Hearns, WBC world Jr. Middleweight champion, knocks out WBA world champion Roberto Durán in two rounds. The WBA elects not to sanction the bout, declaring their version of the title vacant instead.
- Gaelic football
- Ladies' Gaelic football
- Masters Tournament – Ben Crenshaw
- U.S. Open – Fuzzy Zoeller
- British Open – Seve Ballesteros
- PGA Championship – Lee Trevino
- PGA Tour money leader – Tom Watson – $476,260
- Senior PGA Tour money leader – Don January – $328,597
- North America Cup – the inaugural event won by Legal Notice
- United States Pacing Triple Crown races –
- United States Trotting Triple Crown races –
- Australian Inter Dominion Harness Racing Championship –
- Australia – Melbourne Cup won by Black Knight
- Canada – Queen's Plate won by Key to the Moon
- France – Prix de l'Arc de Triomphe won by Sagace
- Ireland – Irish Derby Stakes won by El Gran Senor
- Japan – Japan Cup won by Katsuragi Ace
- 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, Edmonton Oilers
- Hart Memorial Trophy for the NHL's Most Valuable Player: Wayne Gretzky, Edmonton Oilers
- Stanley Cup – Edmonton Oilers won 4 games to 1 over the New York Islanders
- World Hockey Championship –
- U.S. Amateur Pickleball Association, now USA Pickleball, formed.
- Grand Slam in tennis men's results:
- Grand Slam in tennis women's results:
- 1984 Summer Olympics
- Men's Singles competition
- Women's Singles competition
- 1984 Davis Cup
- Sweden wins 4-1 over the United States in Men's world tennis.
- 1984 Federation Cup
- Czechoslovakia wins over Australia in Women's world tennis.
- Olympic Games (Men's Competition) won by Yugoslavia
- See Christian Geoff; "Wiley Has a Knee Injury"; in The West Australian, 7 May 1984, p. 84
- See WAFL Footy Facts – Draws Archived 2014-05-13 at the Wayback Machine
- "Epsom Derby | History, Winners, & Facts | Britannica". www.britannica.com. Retrieved 4 January 2022.