An Austrian tourist dressed as Malcolm McDowell’s sociopathic character in the 1971 flick “A Clockwork Orange’’ drunkenly tumbled to his death on the Williamsburg Bridge early Tuesday, authorities said.

Police were called to the bridge shortly after 6 a.m. and discovered 31-year-old victim Magus Arthur lying in the bridge’s outer lane.

The costumed out-of-towner had been boozing it up for Halloween, when he accidentally fell from the walkway onto the vehicle lane, law-enforcement sources said.

Arthur was then run over, sources said.

The driver who struck him was not charged, telling cops he was unaware that he had hit a person.

The road was closed as police investigated the incident.