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 (name), a given name
- Gustavus, the Latin name given to several Swedish kings:
- Gustav I of Sweden (Gustav Vasa)
- Gustavus Adolphus of Sweden (Gustav II Adolf)
- Gustav III of Sweden
- Gustav IV Adolf of Sweden
- Gustaf V of Sweden (1858–1950)
- Gustaf VI Adolf of Sweden (1882–1973)
- Operation Gustavus, World War II British commando operation in Malaya
- Gustavus (horse)
See also
- Gustav (disambiguation)
- Gusty (disambiguation)