The Cannonball House in Saint Michaels, Maryland, United States, is a historic house built in the early 19th century. The Federal style house is a side-hall double-parlor design on a corner lot, built for shipbuilder William Merchant. It is historically notable for an 1813 event in the War of 1812 in which the British fleet bombarded Saint Michaels, leaving a cannonball embedded in the house. Cannonball House was listed on the National Register of Historic Places in 1983.