Hollywood star Johnny Depp on Monday lost his libel battle with a British tabloid that labelled him a "wife beater," after a London High Court judge ruled he had repeatedly assaulted his former partner and put her in fear for her life.

In a ruling that could severely damage Depp's reputation and career, Judge Andrew Nicol said he accepted claims from the actor's ex-wife, actress Amber Heard, that he had violently assaulted her during their tempestuous five-year relationship.

"I have found that the great majority of alleged assaults of Ms Heard by Mr Depp have been proved to the civil standard," said Nicol. "The claimant has not succeeded in his action for libel."