Mahjong Titans is a mahjong solitaire game developed by Oberon Games and released by Microsoft for the PC in 2006, bundled with certain Windows Vista and Windows 7 installations.
One of the three built-in games included with certain premium versions of the Windows Vista operating system (the other games being InkBall and Chess Titans), Mahjong Titans is a simple mahjong solitaire game with six different configurations, each portraying a different type of animal (Turtle, Dragon, Cat, Fortress, Crab, and Spider). It features multiple themes for both the tiles (Traditional, Primary Color, Pastel, and Large Print) and the background (Seagrass Mat, Green Felt, Brown Felt, Red Felt, and Cherry Blossom) and supports the Windows Media Center service for use with TVs.
It is considered a spiritual successor to the game Taipei included in the Microsoft Entertainment Pack series. Like other pack-in games that are kept when upgrading the Windows operating system, the base installation of Mahjong Titans is removed completely once an April 2018 update of Windows 10 is applied. Its successor in Windows 8 and later is Microsoft Mahjong.