Gustav, Gustave, Gustavs, Gustavo or Gustavus may refer to:
People:
- Gustav (name), a male given name of Old Swedish origin (and list of people with this name)
Fictional characters:
- Gustav (Zoids), transportation mecha in the Zoids fictional universe
- Gustav, a character in Sesamstraße
Other uses:
- Gustave (film), 2007 American film, directed by Michael Katleman
- Gustave (crocodile), a legendary crocodile in Burundi
- Hurricane Gustav (disambiguation) - name used for several tropical cyclones and storms.
- Schwerer Gustav, 800-mm German siege cannon used during World War II
- Carl Gustav recoilless rifle, dubbed the Gustav by US soldiers
- Gustav a.k.a. Eva Jantschitsch, German electronopop artist