The Hyde Mansion, originally known as Elmhurst, is a historic house at 616 High Street in Bath, Maine, United States. Now the main building on the Bath campus of The Hyde Schools, it was built in 1913 for John Sedgewick Hyde, the son of Bath Iron Works (BIW) founder Thomas W. Hyde. It was designed by John Calvin Stevens, and is an example of Colonial Revival architecture. It was listed on the National Register of Historic Places in 1978.