Havre de Grace (ⁱ/ˌhævər dɨˈɡreɪs/; sometimes abbreviated HdG) is a city in Harford County, Maryland, United States. Located at the mouth of the Susquehanna River and the head of the Chesapeake Bay, Havre de Grace is named after the port city of Le Havre, France, which was first named Le Havre de Grâce, meaning in French "Harbor of Grace." As of the 2010 census, the city's population was 12,952.

Havre de Grace is located at 39°32′54″N 76°5′51″W / 39.54833°N 76.0975°W / 39.54833; -76.0975 (39.548412, -76.097554) at the mouth of the Susquehanna River.

According to the United States Census Bureau, the city has a total area of 5.4 square miles (14 km²), of which 4.0 square miles (10 km²) is land and 1.4 square miles (3.6 km²), or 25.23%, is water.

Two railroad mainlines pass through Havre de Grace. More than 80 daily passenger trains on Amtrak's busy Northeast Corridor speed through Havre de Grace at 90 miles per hour (145 km/h) on an elevated line for traversing the adjacent Susquehanna River Bridge. The double track bridge was built by the Pennsylvania Railroad between 1904–1906 for its New York City–Washington, D.C. line. The Philadelphia Subdivision of CSX Transportation, originally constructed by the Baltimore and Ohio Railroad, carries a heavy volume of freight. The CSX line crosses the river on the CSX Susquehanna River Bridge, rebuilt between 1907–1910, about 1 mile upstream of the Amtrak bridge.

Maryland (ⁱ/ˈmɛrɨlənd/) is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east. Maryland was the seventh state to ratify the United States Constitution, and three nicknames for it (the Old Line State, the Free State, and the Chesapeake Bay State) are occasionally used. Maryland is the 9th smallest state by area, but the 19th most populous and the 5th most densely populated of the 50 United States. The state's most populated city is Baltimore. Its capital is Annapolis. It was named after Queen Henrietta Maria.

Maryland has an area of 12,406.68 square miles (32,133.2 km²) and is comparable in overall area with the European country of Belgium (11,787 square miles (30,530 km²)). It is the 42nd largest/9th smallest state, and is closest in size to Hawaii (10,930.98 square miles (28,311.1 km²)), the next smallest state. The next largest state, Maryland's neighbor West Virginia, is almost twice the size of Maryland (24,229.76 square miles (62,754.8 km²)).