The 27-year-old had been charged following an incident that took place only hours after a West Indies one-day international in Bristol in September last year.
Codefendant Ryan Ali was also unanimously found not guilty.
Stokes closed his eyes and appeared relieved when the not guilty verdicts were returned.
He shook hands with fellow defendant, Ali, who told waiting media that he was "relieved it was all over".
Stokes still faces possible disciplinary action from the England and Wales Cricket Board.