The Alvah Horace Whitmarsh House is a historic house at 711 Pecan Street in Texarkana, Arkansas. This 2-1/2 story wood frame structure is one of the city's finest Queen Anne Victorians, located in a neighborhood that was fashionable at the turn of the 20th century. The house has an elaborately decorated front porch and a three-story hexagonal tower, capped by a pointed roof, at its northeast corner. The house was built in 1894 for Alvah Whitmarsh, a manager at the local Buchanan Lumber Company and a local leader in civic affairs.