Helen's Tower is a 19th-century folly and lookout tower near Bangor, County Down, Northern Ireland.
It was built by the 5th Baron of Dufferin and Claneboye and named for his mother, Helen. He intended it as a shrine for poems, first of all a poem by his mother and then other poems that he solicited from famous poets over the years. Tennyson's Helen's Tower is the best known of them. The tower is a fine example of Scottish Baronial architecture. Helen's Tower inspired the design of the Ulster Tower, a war memorial at Thiepval, France.