Dragon Quest IX: Sentinels of the Starry Skies is a role-playing video game developed by Level-5 for the Nintendo DS.

Dragon Quest IX continues the Dragon Quest tradition of turn-based combat and is considered harder than the other Dragon Quest games before it. The game allows players to have a cooperative wireless multi-player experience with up to four players; it does not, however, feature multi-player capabilities via Nintendo Wi-Fi. Multiplayer play requires a game cartridge for each player. The game includes only one save slot, whereas most have at least three.