Lost may refer to:
- Atlantis, the Lost City of the Ancients
- "Paradise Lost", the 15th episode of Stargate SG-1 Season 6
- "Lost City", Part 1, the 21st episode of Stargate SG-1 Season 7
- "Lost City", Part 2, the 22nd episode of Stargate SG-1 Season 7 and direct following of the previous one
- "The Lost Boys", the 10th episode of Stargate Atlantis Season 2
- "The Lost Tribe", the 10th episode of Stargate Atlantis Season 5
- "Lost", the 15th episode of Stargate Universe Season 1
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