A woman working at the Centra store on the UCD campus at Belfield was threatened with a gun and a metal bar during a late-night raid.
She was tied up during the robbery which occurred at 10pm on Wednesday. Two men went into the store as the woman was closing up.
The two men armed with a gun and a metal bar threatened the woman and a male employee. They fled the scene with cash from the till and safe.
The woman and man weren't physically harmed during the incident.
Gardaí are currently investigating.