E. T. Slattery was a clothing store in downtown Boston in the 19th and 20th centuries. It was a high-end store offering women's, children's, and men's apparel and accessories. The store was founded by Ellen T. Slattery in 1867. It was first located on Hayward Place off Washington Street, then moved to 631 Tremont Street, then Boylston Street, then 84 Beacon Street, then 156 Tremont Street across from the Boston Common in 1901, where it remained until it closed in 1957.