Northumberland is a rural county in North East England, on the England-Scotland border. It contains one of the most picturesque and untouched stretches of coastline in the United Kingdom and contains rolling hills and low mountains in the sparsely populated interior.

Notable local attractions in Northumberland include: Hadrian’s Wall, a UNESCO World Heritage Site, the North Pennies Area of Outstanding Natural Beauty, Dunstanburgh Castle, Bamburgh Castle, Wallington House and Garden, Berwick-upon-Tweed Barracks and Main Guard, Hexham Abbey & Northumberland National Park.

Northumberland has a diverse physical geography. It is low and flat near the North Sea coast and increasingly mountainous towards the northwest. Being in the far north of England, above 55° latitude, and having many areas of high land, Northumberland is one of the coldest areas of the country.

Northumberland is a borough in Northumberland County, Pennsylvania, United States. The population was 3,714 at the 2000 census. Northumberland was founded in 1772.