A port and town on the River Medway in Kent, England; the home of the Royal dockyard (OS grid ref TQ7667). • Any of several other places of the same name: • A settlement near Machen in Bedwas, Trethomas and Machen community, Caerphilly borough, Wales (OS grid ref ST2189). • A community and former township in Chatham-Kent municipality, southwestern Ontario, Canada. • A number of places in the United States: • A neighbourhood of Sitka, Alaska, named after Chatham Strait. • An unincorporated community in Monroe County, Florida. • A community area and neighbourhood in Chicago, Illinois. • A village and township in Sangamon County, Illinois. • An unincorporated community in Perry Township, Buchanan County, Iowa. • An unincorporated community in Bracken County, Kentucky. • A town in Jackson Parish, Louisiana. • A town and census-designated place therein, in Barnstable County, Massachusetts. • A village in Rock River Township, Alger County, Michigan. • A township in Wright County, Minnesota. • An unincorporated community in Washington County, Mississippi. • A town in Carroll County, New Hampshire. • A borough and township in Morris County, New Jersey. • A town in Columbia County, New York. • A village in the towns of Chatham and Ghent, Columbia County, New York. • An unincorporated community in Licking County, Ohio. • An unincorporated community and township in Medina County, Ohio. • An unincorporated community in London Grove Township, Chester County, Pennsylvania. • A township in Tioga County, Pennsylvania. • A town, the county seat of Pittsylvania County, Virginia. • An English habitational surname from the place name. • Ellipsis of Earl of Chatham; usually the first Earl, prime minister William Pitt ('Pitt the Elder').