The Mario franchise is a video game series created by Nintendo. Nintendo is usually the developer and publisher of the franchise's games, but various games are developed by third-party companies, such as Hudson Soft and Intelligent Systems. Games in the Mario franchise primarily revolve around the protagonist Mario and often involve the trope of Bowser as the antagonist kidnapping Princess Peach, with Mario then rescuing her. Many characters have goals or plot arcs that vary between series; for example, the Luigi's Mansion games focus on Luigi ridding a haunted building of ghost-like creatures known as Boos, and Wario stars in games that center around his greed and desire for money and treasure.

The franchise began with Donkey Kong in 1981, where Mario, Donkey Kong, and Pauline originated. Japanese video game designer Shigeru Miyamoto built them off the base of characters from Popeye. Unable to license the characters, Miyamoto made later changes to their appearances and personalities, such as a more lighthearted in tone. Due to the breakthrough critical and commercial success of Donkey Kong, Mario reappeared in Mario Bros. in 1983, which introduced Mario's twin brother Luigi, and Super Mario Bros. in 1985, which introduced Toad alongside numerous enemies, with Bowser and Princess Peach replacing Donkey Kong and Pauline, respectively.

Each series has introduced numerous characters, many of them recurring. Some have starred in their own games or in supporting roles. The games all typically share common enemies.