The Lord of the Rings star was attacked outside the Hill Bar and Brasserie in Camden, north London during a night out and was left with a stab wound to his arm, according to Britain's Daily Mail.
An unidentified attacker cut the actor with a broken glass and punched him in the face, and police were called to the scene.
However, Bean declined hospital treatment and went back inside the bar, where staff used a first aid kit to tend to his injuries. He then reportedly ordered another drink.
A member of staff tells the Daily Mail, "Sean is a regular here and we've never had any problems before. He was with a very attractive woman and an incident occurred outside the bar. He came in with a cut on his arm and a bruise on his eyebrow. We saw to his injuries with the first aid kit. He seemed OK and wanted to have another drink."