The Wii MotionPlus (Wiiモーションプラス) is an expansion device for the Wii Remote, the primary game controller for the Wii. The device allows more complex motion to be interpreted than the Wii Remote can do alone. Both the Wii and its successor, the Wii U, support the Wii MotionPlus accessory in games.

The Wii Remote, also known colloquially as the Wiimote, is the primary game controller for Nintendo's Wii home video game console. An essential capability of the Wii Remote is its motion sensing capability, which allows the user to interact with and manipulate items on screen via motion sensing, gesture recognition, and pointing using an accelerometer and optical sensor technology. It is expandable by adding attachments. The attachment bundled with the Wii console is the Nunchuk, which complements the Wii Remote by providing functions similar to those in gamepad controllers. Some other attachments include the Classic Controller, Wii Zapper, and the Wii Wheel, which was originally released with the racing game, Mario Kart Wii.