The Super Mario Bros. 35th Anniversary was a celebration of the Super Mario video game series created by Shigeru Miyamoto. The series began with the release of Super Mario Bros. on September 13, 1985, and has since spanned over twenty games appearing on every major Nintendo video game console. Through a series of leaks initially reported by Video Games Chronicle in March 2020, plans revealed that Nintendo originally planned to celebrate the anniversary earlier in 2020; however, due to the COVID-19 pandemic, the anniversary was postponed to September that same year. The anniversary was announced in a Nintendo Direct on September 3, 2020, and ran until March 31, 2021.

Mario is a Japanese multimedia franchise created by Japanese game designer Shigeru Miyamoto for video game company Nintendo, which produces and publishes its installments. Starring the titular Italian plumber Mario, it is primarily a video game franchise but has extended to other forms of media, including television series, comic books, a 1993 feature film, a 2023 animated film, and theme park attractions. The series' first installment was 1983's Mario Bros., although Mario made his first appearance in 1981's arcade game Donkey Kong and had already been featured in several games of the Donkey Kong and Game & Watch series. The Mario games have been developed by a wide variety of developers, including Nintendo, Hudson Soft, and AlphaDream. Mario games have been released almost exclusively for Nintendo's various video game consoles and handhelds, from the third generation onward.