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Vassal may refer to:
- vassal, a person regarded as having personal obligations to a landowner or monarch, in exchange for particular rights;
- vassal state, a state that is subordinate to another state;
- Vassal Engine, a free software engine used for adapting boardgames to online play, and;
- Vassal Gadoengin (c.1943 – 2004), Nauruan politician.