Lesley-Travers Mansion, also known as the Deemer House, Travers House, and Lesley House, is a historic home located at New Castle, New Castle County, Delaware. It was designed by noted Baltimore architects Thomas and James Dixon and built in 1855. It has a two-story, five bay, brick core with several appendages and wings. It has a castle-like appearance, with a slate-covered steeply pitched gable roof and five-story tower, and is in the Gothic Revival style.
It was added to the National Register of Historic Places in 1973.