The Dining Room is a room in Gloomy Manor in the game Luigi's Mansion: Dark Moon. This is a large room and it's located near the Kitchen. This room is most notable for Luigi's first encounter with a Boo in Luigi's Mansion: Dark Moon.
During A-4: Visual Tricks, Luigi heads into the Dining Room where he runs into a Boo for the first time. Luigi also learns that it is the Boos that are behind the Spirit Balls and they make the table disappear. Luigi reveals the table using the Dark-Light Device and vacuums up all of the Spirit Balls into the Poltergust 5000. The Boo reappears and it isn't happy with Luigi's actions and proceeds to fight him. Using the Dark-Light Device, Luigi captures the Boo and E. Gadd decides to Pixelate out of the mansion to review the Boo.