| Date | Sport | Venue/Event | Status | Winner/s |
| 1 | Formula racing |  2021 Hungarian Grand Prix (F1 #11) | International |  Esteban Ocon ( Alpine-Renault) |
| 1–7 | Multi-sport |  2021 Commonwealth Youth Games | International | Postponed to 4–11 August 2023 |
| 1–7 | Aeromodelling |  2021 FAI F3B World Championship for Model Gliders | International | Cancelled |
| 5–8 | Multi-sport | .svg.png) 2021 Masters Indigenous Games | International | Postponed to 17–23 August 2023 |
| 5–8 | Golf |  2021 WGC-FedEx St. Jude Invitational (WGC #3) | International |  Abraham Ancer |
| 5–15 | Handball |  2021 European Women's U-17 Handball Championship | Continental | Hungary |
| 6–14 | Basketball | .svg.png) 2021 FIBA U16 Women's European Championship | Continental | Cancelled |
| 6–15 | Athletics | 2021 World Athletics Championships | International | Postponed to 15–24 July 2022 |
| 6–15 | Basketball |  2021 FIBA Under-16 African Championship | Continental | Egypt |
| 6–15 May 2022 | Association football | 2021–22 Primeira Liga | Domestic | Porto |
| 6–21 May 2022 | Association football | 2021–22 Ligue 1 | Domestic | Paris Saint-Germain |
| 7–15 | Basketball | 2021 FIBA U16 Women's African Championship | Continental |  Mali |
| 7–15 | Basketball | 2021 FIBA Under-19 Women's Basketball World Cup | International | United States |
| 7–15 | Sailing | 2020 J/70 World Championship† | International | Peter Duncan |
| 7–21 | Gliding | 36th FAI World Gliding Championships | International | |
| 8 | Motorcycle racing |  2021 Styrian motorcycle Grand Prix (MotoGP #10) | International | |
| 8–15 | Tennis | 2021 Canadian Open | International | |
| 9–14 | Sailing | 2021 Youth Match Racing World Championship | International | David Wood |
| 9–15 | Archery |  2021 World Archery Youth Championships | International |  India |
| 9–21 | Parachuting |  2020 FAI World Parachuting Championships† | International | Russian Parachuting Federation |
| 10–15 | Basketball |  2020 FIBA European Championship for Small Countries† | Continental | Ireland |
| 11 | Association football | .svg.png) 2021 UEFA Super Cup | Continental |  Chelsea |
| 11–15 | Beach volleyball |  2021 European Beach Volleyball Championships | Continental | |
| 11–15 | Rowing |  2021 World Rowing Junior Championships | International | .png) United States |
| 12–15 | Taekwondo | 2021 World Taekwondo Cadet Championships | International | Cancelled |
| 12–16 | Fishing |  2021 World Fly Fishing Championship | International | - Individual: Heikki Kurtti
- Team: Finland
|
| 12–22 | Handball |  2021 European Men's U-19 Handball Championship | Continental |  Germany |
| 13–15 | Open water swimming |  2021 FINA World Junior Open Water Swimming Championships | International | Postponed to 16–18 September 2022 |
| 13–15 | Rallying | .svg.png) 2021 Ypres Rally (WRC #8) | International | |
| 13–21 | Basketball |  2021 FIBA U16 European Championship | Continental | Cancelled |
| 13–22 | Baseball |  2021 U-12 Baseball World Cup | International | Postponed to 28 July–7 August 2022 |
| 13–14 May 2022 | Association football | 2021–22 Bundesliga | Domestic | Bayern Munich |
| 13–15 May 2022 | Association football |  2021–22 Eredivisie | Domestic | Ajax |
| 13–22 May 2022 | Association football |  2021–22 La Liga | Domestic | Real Madrid |
| 13–22 May 2022 | Association football | 2021–22 Premier League | Domestic | Manchester City |
| 14–15 | Fishing | 2021 Feeder Fishing World Championship | International | - Individual: Benny Mertens
- Team: Belgium
|
| 14–15 | Formula racing | 2021 Berlin ePrix (FE #14/15) | International | |
| 14–21 | Sailing | 2021 12 Metre World Championship | International | Patrick Howaldt |
| 14–5 September | Road bicycle racing | 2021 Vuelta a España (Grand Tour #3) | International |  Primož Roglič ( Team Jumbo–Visma) |
| 14–2 October | Rugby union |  /.svg.png) / / 2021 Rugby Championship | International | New Zealand |
| 15 | Motorcycle racing | 2021 Austrian motorcycle Grand Prix (MotoGP #11) | International | |
| 16–21 | Sailing |  2021 Raceboard World Championships | International | |
| 16–22 | Sailing | .svg.png) 2021 iQFoil World Championships | International | |
| 16–22 | Tennis | 2021 Cincinnati Masters | International | |
| 16–22 | Wrestling | 2021 World Junior Wrestling Championships | International | Russia |
| 17–19 | Judo | 2021 European Cadet Judo Championships | Continental | Russia |
| 17–22 | Track cycling | 2021 UEC European Track Championships (under-23 & junior) | Continental | Russia |
| 17–29 | Basketball |  2021 FIBA Asia Cup | Continental | Postponed to 12–24 July 2022 |
| 18–22 | Athletics |  2021 World Athletics U20 Championships | International | Kenya |
| 18–23 | Volleyball | 2021 Men's NORCECA Volleyball Championship | Continental |  Puerto Rico |
| 18–29 | Handball |  2021 Men's Youth World Handball Championship | International | Cancelled |
| 18–29 | Multi-sport |  2021 Summer World University Games | International | Postponed to 28 July–8 August 2023 |
| 18–4 September | Volleyball |  /// 2021 Women's European Volleyball Championship | Continental |  Italy |
| 19–22 | Canoe slalom | 2021 European Junior and U23 Canoe Slalom Championships | Continental |  Czech Republic |
| 19–22 | Golf |  2021 Women's British Open | International |  Anna Nordqvist |
| 19–22 | Orienteering |  2021 European Youth Orienteering Championships | Continental | Finland |
| 19–29 | Baseball | 2021 Little League World Series | Domestic |  Taylor North Little League |
| 19–29 | Beach soccer | 2021 FIFA Beach Soccer World Cup | International |  RFU |
| 19–5 September | Golf | 2021 FedEx Cup Playoffs | International | |
| 20–22 | BMX racing | 2021 UCI BMX World Championships | International | |
| 20–22 | Karate | 2021 European Cadet, Junior & U21 Karate Championships | Continental |  Turkey |
| 20–22 | Rallycross | 2021 World RX of Sweden (WRX #2) | International | Timmy Hansen ( Hansen World RX Team) |
| 20–28 | Aerobatics | 22nd FAI European Aerobatic Championships | Continental | Cancelled |
| 20–31 | Ice hockey | 2021 IIHF Women's World Championship | International | Canada |
| 21–22 | Endurance racing | 2021 24 Hours of Le Mans (WEC #4) | International | |
| 21–28 | Field hockey |  2021 Men's Junior Pan American Championship
2021 Women's Junior Pan American Championship | Continental | |
| 21–28 | Fishing | 2021 Long Casting of Sea Weights World Championships | International | Argentina |
| 21–29 | Artistic swimming | 2021 FINA World Junior & Youth Artistic Swimming Championships | International | Postponed to 10–14 August 2022 |
| 21–29 | Water Polo | 2021 LEN Women European Junior Water Polo Championship | Continental | Russia |
| 21–31 | Sport climbing | 2021 IFSC Climbing World Youth Championship | International |  Japan |
| 21–22 May 2022 | Association football | 2021–22 Serie A | Domestic | AC Milan |
| 22–25 | Handball | 2021 Nor.Ca. Women's Handball Championship | Regional | Puerto Rico |
| 22–28 | Sailing | 2021 Platu 25 World Championship | International |  Mati Sepp |
| 23–29 | Basketball | 2021 FIBA Under-16 Americas Championship | Continental | United States |
| 23–29 | Basketball | 2021 FIBA Under-16 Women's Americas Championship | Continental | United States |
| 23–29 | Equestrian | 2021 FEI World Vaulting Championships | International | Germany |
| 24–29 | Basketball | 2021 FIBA 3x3 U18 World Cup | International | |
| 24–2 September | Volleyball |  2021 FIVB Volleyball Boys' U19 World Championship | International | Poland |
| 24–5 September | Basketball |  AfroBasket 2021 | Continental |  Tunisia |
| 24–5 September | Olympics | 2020 Summer Paralympics† | International | China |
| 24–6 September | Association football | 2021 Arab Women's Cup | International |  Jordan |
| 25–28 | Karate | 2021 Pan American Cadet, Junior and U21 Karate Championships | Continental | Postponed to 25–27 August 2022 |
| 25–29 | Biathle & Triathle | 2021 Biathle/Triathle World Championships | International | Czech Republic |
| 25–29 | Floorball | 2021 Men's under-19 World Floorball Championships | International | Czech Republic |
| 25–29 | Mountain bike racing | 2021 UCI Mountain Bike World Championships | International | France |
| 26–29 | Athletics | 2021 European Athletics U18 Championships | Continental | Cancelled |
| 26–29 | Summer biathlon | Summer Biathlon World Championships 2021 | International | Czech Republic |
| 27–30 | Beach sambo |  2021 World Beach Sambo Championships | International | Russian Sambo Federation |
| 28–29 | Fishing | 2021 Carnivorous Artificial Bait Shore Angling World Championship for Nations | International | - Individual:
 Nazariy Bozhenko - Team: Ukraine
|
| 28–29 | Formula racing | 2021 Spa-Francorchamps FIA Formula 3 round (F3 #5) | International | |
| 28–29 | Off-road racing |  2021 Arctic X-Prix (Extreme E #3) | International | Johan Kristoffersson & Molly Taylor ( Andretti United XE) |
| 28–5 September | Water polo | 2021 FINA World Men's Junior Water Polo Championships | International | Serbia |
| 29 | Formula racing | 2021 Belgian Grand Prix (F1 #12) | International | Max Verstappen ( Red Bull Racing-Honda) |
| 29 | Motorcycle racing |  2021 British motorcycle Grand Prix (MotoGP #12) | International | |
| 30–4 September | Archery | 2021 European 3D Championships | Continental | Italy |
| 30–12 September | Tennis | 2021 US Open (Grand Slam #4) | International | |
| 31–7 September | Sailing | 2021 Moth World Championship | International | Tom Slingsby |
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