Gustav Hahn
Gustav Hahn is the name of the following people:
- Gustav Hahn (painter) (1866–1962), Canadian wall painter and art teacher of German origin
- Gustav Hahn (genealogist) (1900–1974), German teacher and genealogist
- Gustav Römer-Hahn (1908–1960), German actor
- Gustav Adolf Hahn (1819–1872), German architect and architectural painter