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On This Day, July 21
- 2025: A Bangladesh Air Force Chengdu FT-7BGI crashes shortly after takeoff into Milestone School campus in Dhaka, Bangladesh, killing 35 people and injuring 173.
- 2024: U.S. President Joe Biden announces he will no longer seek a second term and withdraws from the 2024 election, endorsing Vice President Kamala Harris as she launches her own presidential campaign.
- 2023: The Barbenheimer phenomenon begins as two major motion pictures, Greta Gerwig's fantasy comedy Barbie and Christopher Nolan's epic biographical thriller Oppenheimer, are released in theaters on the same day and audiences, instead of creating a rivalry between the extremely dissimilar films, instead attend and praise both as an informal, surreal double feature.
- 2019: Yuen Long attack or "721 incident" in Hong Kong. Triad members indiscriminately beat civilians returning from protests while police failed to take action.
- 2012: Erden Eruç completes the first solo human-powered circumnavigation of the world.