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The Belfry is a room inside of the Old Clockworks in Luigi's Mansion: Dark Moon. The Belfry is only accessed by taking the north door inside of the Movements. The Belfry is a two story room. The first part of the room has many crates and a ladder. At the top of the Belfry is the Belfry Clock, which the Overset Possessor possesses.
During C-Boss: Showtime, Luigi must go to the Belfry to find the Dark Moon piece that the Parascope located. When Luigi attempts to climb the ladder to the top, he is launched up by a spring onto the Belfry Clock, where he confronts the Overset Possessor. After the Overset Possessor is defeated, Luigi can claim the Dark Moon piece to end the mission.