Strife is a three-act play by the English writer John Galsworthy. It was his third play, and the most successful of the three. It was produced in 1909 in London at the Duke of York's Theatre, and in New York at the New Theatre. In the play, there is a prolonged unofficial strike at a factory; as the trade union and the company directors attempt to resolve the affair, which is causing hardship among the workers' families, there is a confrontation between the company chairman and the leader of the strike.