The James H. Mann House is a historic house at 23 Hancock Street in Winchester, Massachusetts. The -story wood-frame house was built by James H. Mann for his own use. Mann was a prominent local builder who also built the Carr-Jeeves House, another picturesque house with a mixture of architectural elements. This house is predominantly Gothic Revival in character, with its main body topped by a double roof roughly looking like a monitor. There is a three-story tower topped by a jerkin-headed roof, whose gable lines are decorated by Stick-style vergeboard.
The house was listed on the National Register of Historic Places in 1989.