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Foster may refer to:
- William Foster, part of the Vault 112 Tranquility Lane simulation in Fallout 3.
- Private Foster, a mentioned-only character in the Fallout: New Vegas add-on Lonesome Road.
- Brother Foster, a member of the Children of Atom living at the Crater of Atom in Fallout 4.
- Lieutenant Foster, a member of the Commonwealth Minutemen mentioned in Fallout 4.