Barrington also established himself on the legitimate stage, playing Falstaff in "The Merry Wives of Windsor" at His Majesty's Theatre in 1911; he appeared in "Baron Trenck" and in several other roles from 1911 to 1913; on tour in "Other People's Babies", by Lechmere Worrall, in 1913; as Lord Leonard Alcar in the highly successful "The Great Adventure" by Arnold Bennett (1913–14; based on Bennett's 1908 novel, "Buried Alive"); as Max Somossy in "The Joy-Ride Lady", by Arthur Anderson and Hartley Carrick at the New Theatre (1914); and Polonius in "Hamlet" and Christopher Sly in "The Taming of the Shrew" at His Majesty's in 1916, among other roles. He continued to perform in London and in the provinces until 1918, from 1916 under the management of John Martin-Harvey. One of his later successes was a reprise of his 1909 role as the kindly bookmaker Peter Perks in "A Member of Tattersall's". His last role was Claus in "The Burgomaster of Stilemonde", by Count Maurice Maeterlinck, at the Lyceum Theatre, Edinburgh, beginning in October 1918.