Firefighters were sent to the Hershey Lodge early Thursday to investigate a reported odor of smoke.
The hotel at 325 University Drive was evacuated when the smell was first detected near the Bear's Den sports bar at around 6:30 a.m.
Seventeen rooms were occupied at the time.
Guests were allowed to return to their rooms in about an hour, and the restaurant and hotel were able to resume normal operations.
Firefighters believe the smoke came from one of the heating vents in the loft area.