The Zachariah Allen House is a historic house at 1093 Smith Street in Providence, Rhode Island. Built in 1789 by Amos Allen for his brother Zachariah, it is a 2-1/2 story wood frame structure, five bays wide, with a central entry and large central chimney. It is a well-preserved example of a transitional Georgian-Federal style house, having retained original siding materials on the outside, and finish woodwork on the interior. Its major modifications include the 20th-century installation of new hardwood floors, as well as modern plumbing and kitchen. Zachariah Allen was at the time a successful merchant, and the house was built as a summer retreat in what was at the time a rural area.