The Dirty Colossus Archstone is a location in Demon's Souls.
- Archstone of the Demon Dirty Colossus
- In a swamp infested by poisonous and vile creatures lies a filth-encrusted valley. The poor journey to this rotten place to offer their souls so that they might be freed from their suffering.
The Dirty Colossus Archstone is one of the four Archstones accessed through the Archstone of the Chieftain.