A BDSM dungeon is an indoor space designated specifically for BDSM play or BDSM scenes. These spaces are usually stocked with various BDSM toys and equipment which can be used during scenes. Some dungeons may even come equipped with shackles on the walls or St. Andrew's crosses. Any number of BDSM activities can occur in a dungeon including activities such as flogging, bondage, suspension, blood play, age play, and resistance play.

The term dungeon does not necessarily mean that these spaces are in castles or underground. Private dungeons, such as those inside private residences, may occupy space in basements, but can also be set up in bedrooms, spare rooms, or even large walk-in closets. Public dungeons may occupy warehouses or nightclubs and are usually open to the public, although they typically operate very quietly.

Patronizing your first BDSM dungeon or attending your first BDSM party can be an exhilarating yet nerve-wracking experience. Keep in mind that safety and privacy are strongly emphasized during any BDSM event, and you will most likely be required to agree to and follow a number of rules while at a BDSM dungeon. For instance, one of the most important rules at a BDSM dungeon is that you don't discuss what happens in the dungeon or who was there. You should also be careful not to push anyone for their personal information, such as their last names or where they work. Finally, respect is mandatory when going to a BDSM dungeon. In general, don't touch anyone without permission and use your manners at all times, otherwise you may be asked to leave