The Grace Cooke House, also known as the Harold St. John Residence, at 2365 Oʻahu Avenue in Honolulu, Hawaiʻi, is significant both for its American Craftsman bungalow architecture and landscaping and for its most famous resident, Harold St. John, a distinguished professor of botany at the University of Hawaiʻi. The house and lot were added to the National Register of Historic Places in 1983, by which time St. John was living in a separate small cottage to the rear of the lot.