"Dr. Heidegger's Experiment" is a short story by American author Nathaniel Hawthorne about a doctor who claims to have been sent water from the Fountain of Youth.

It was included in 1837 in Hawthorne's collection Twice-Told Tales. Edgar Allen Poe reviewed the second edition of the collection in 1842 and wrote that "Dr. Heidegger's Experiment was exceedingly well imagined and executed with surpassing ability. The artist breathes in every line of it."