Canton House is a historic office building located on the northeast corner of Water Street and South Street in Baltimore, Maryland, United States. It is a 4+1⁄2-story Colonial Revival-style building, with seven bays across the front façade of Water Street to the south and three bays across the side facing South Street to the west. The first story level is in marble and brick is laid in Flemish bond from the second story up. It has a sloped peaked roof with two dormer windows facing west to the side. The main entrance features two fluted Corinthian stone columns.