Heidegger may refer to:
- Heidegger (surname)
- Martin Heidegger (1889–1976), a German philosopher
- Johann Heinrich Heidegger (1633-1698), a Swiss theologian
- Heidegger, a philosophical body of work encompassed by Heidegger Gesamtausgabe
In fictional characters:
- Heidegger, a character in Final Fantasy VII
- Heidegger, a character in "Dr. Heidegger's Experiment", a short story by Nathaniel Hawthorne