Contra 4 is a 2D action game for the Nintendo DS and the eleventh original installment in the Contra series. The game was released in North America on November 13, 2007.

The plot is set in 2636, six months after the events of Contra III: The Alien Wars and two years before the events of Contra: Rogue Corps. With the Red Falcon alien threat defeated and the Alien Wars over, the Earth is peaceful once again. However, a similar alien entity calling herself Black Viper begins launching similar attacks against the human race, causing mass destruction over the planet. After strange readings are detected at the Galuga archipelago (the setting of the original Contra), the Earth Federation sends their four strongest Contra Force commandos on a final strike mission to destroy Black Viper and her army of aliens, robots, and mutants.