Gustavus may refer to:
- Gustavus, Alaska, a small community located on the edge of Glacier Bay National Park and Preserve
- Gustavus Adolphus College, a private liberal arts college in southern Minnesota
- Gustavus, the Latin name given to several Swedish kings:
- Gustav I of Sweden (Gustav Vasa)
- Gustavus Adolphus of Sweden (Gustav II Adolf)
- Gustavus III of Sweden
- Gustaf IV Adolf of Sweden
- Gustaf V of Sweden (Oscar Gustaf Adolf)
- Gustaf VI Adolf of Sweden (Oskar Fredrik Wilhelm Olaf Gustaf Adolf)
- Gustavus Conyngham, merchant sea captain, officer in the Continental Navy and a privateer.
- Operation Gustavus, WWII British commando operation in Malaya
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