Mario & Luigi: Superstar Saga is a turn-based action RPG for the Game Boy Advance, developed by AlphaDream and published by Nintendo. It was released in November of 2003 for the Game Boy Advance and later as a Virtual Console title for the Wii U in April of 2014. The plot revolves around Mario and Luigi traveling to and exploring the Beanbean Kingdom to recover Princess Peach's voice from an evil witch, Cackletta, and her pupil, Fawful.

In addition to being the first installment in the Mario & Luigi series, this game is also the third Mario RPG following Super Mario RPG: Legend of the Seven Stars and Paper Mario respectively. It would itself be succeeded by Mario & Luigi: Partners in Time for the Nintendo DS in 2005. Notably, the game takes heavy inspiration from Tomato Adventure, AlphaDream's first Game Boy Advance RPG, featuring very similar graphics, sound effects, and even allusions to certain characters. This game features rumble support if played on a Game Boy Player. The remake of the Mario Bros. arcade game featured in the Super Mario Advance series of games was also included with Mario & Luigi: Superstar Saga.

A remake of this game for the Nintendo 3DS, titled Mario & Luigi: Superstar Saga + Bowser's Minions, was released in October of 2017, featuring a new, exclusive sidequest mode coinciding with the main story. As such, it is the first and currently one of only two installments in the Mario & Luigi series to receive a remake. The second would be Mario & Luigi: Bowser's Inside Story, which received a remake titled Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey a decade later.