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Mystery Dungeon
Developer(s)	Chunsoft
Publisher(s)	Chunsoft, Sega, Nintendo
Japanese title	不思議のダンジョン ,Fushigi no Dungeon
Years active	September 19, 1993–present
Genre(s)	Roguelike
System(s)	Super Famicom, Nintendo 64, Wii, Game Boy, Nintendo DS
Mode(s)	Single player, Multiplayer

Mystery Dungeon (不思議のダンジョン ,Fushigi no Dungeon) is a series of roguelike video games, most of which were developed by Chunsoft, but with select titles in the series developed under license by other companies. Although all games in the series bear the Fushigi no Dungeon moniker somewhere in their Japanese titles, only the Shiren the Wanderer games contain original characters; all others license their characters from other role-playing game franchises.

The first title, Torneko no Daibōken: Fushigi no Dungeon starred Torneko, a shopkeeper character from the same developer's Dragon Quest IV (Chunsoft being developer of the first five games in the Dragon Quest series). Various series of Mystery Dungeon titles include the Chocobo no Fushigina Dungeon series which includes Final Fantasy Fables: Chocobo's Dungeon and the Pokémon Mystery Dungeon series.

Mystery Dungeon games are notable for being among the few console games in the roguelike genre. The series has inspired similar titles in Japan, most of which appropriate their games mechanics from Mystery Dungeon, rather than Rogue itself.