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Sink may refer to:
- Sink Central Intelligence Unit (SCIU), an automated personality operating in the Sink (location) in the Big MT in 2281 in the Fallout: New Vegas add-on Old World Blues.
- Sink (computer), a computerized talking faucet in the same location as the Sink Central Intelligence Unit.
- The Sink, a central hub and player housing in the Big MT in the Fallout: New Vegas add-on Old World Blues.
- Sink (Fallout 4), a miscellaneous world object in Fallout 4 and a constructible settlement object in the add-on Vault-Tec Workshop.
- Clean sink, a workshop object in Fallout 76.