Mario & Sonic at the Olympic Games Tokyo 2020[b] is a 2019 sports video game based on the 2020 Summer Olympics. It is the sixth game in the Mario & Sonic series, a crossover between Nintendo's Super Mario and Sega's Sonic the Hedgehog franchises, and the first since the Rio 2016 Olympic Games edition. It was developed and published by Sega for the Nintendo Switch in November 2019 and for arcade cabinets in 2020.

The game received mixed reviews, with praise for the presentation and gameplay, but criticism for a perceived lack of content for single-player, multiplayer features, and the story mode.In October 2016, Sega announced it had secured the licensing rights from the International Olympic Committee to publish video games based on the 2020 Summer Olympics, with plans for games to be released on various devices.[7] Mario & Sonic at the Olympic Games Tokyo 2020 was announced alongside Olympic Games Tokyo 2020 - The Official Video Game on March 29, 2019, at the Sega Fes stage show in Japan. It was the first Mario & Sonic game since the Rio 2016 Olympic Games edition for the Wii U and Nintendo 3DS,  and was released worldwide for the Nintendo Switch in November 2019; a version for arcade cabinets will release sometime in 2020. A companion game for Android and iOS, Sonic at the Olympic Games - Tokyo 2020, was also released in 2020.