Mario & Luigi: Dream Team, known in Europe and Australia as Mario & Luigi: Dream Team Bros., is a 2013 role-playing video game developed by AlphaDream and published by Nintendo for the Nintendo 3DS. It is the fourth installment in the Mario & Luigi series, a part of the larger Mario franchise. The game's story follows Mario and his brother Luigi who, after being invited to Pi'illo Island for a vacation, become embroiled in a journey to retrieve a powerful artifact before Bowser and Antasma use it for evil intentions. The gameplay takes place from a top-down perspective and has the player controlling Mario and Luigi simultaneously, solving puzzles and platformer sessions, and overcoming turn-based battles across Pi'illo Island, the game's overworld. The player also makes use of Luigi's dreams, called the "Dream World", where gameplay shifts to a two-dimensional side-scrolling perspective and emphasizes using Luigi-based gimmicks to their advantage. Combat in both worlds is turn-based.

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.