Antwerp's diamond district, also known as the Diamond Quarter (Diamantkwartier), and dubbed the Square Mile, is an area within the city of Antwerp, Belgium. It consists of several square blocks covering an area of about one square mile. While as of 2012, much of the gem cutting and polishing work historically done in the neighborhood had moved to low wage centers elsewhere, about 84% of the world's rough diamonds passed through the district, making it the largest diamond district in the world with a turnover of 54 billion dollars. Each year, approximately 50% of the rough diamonds return to Antwerp for cutting and polishing.

Antwerp is a city and a municipality in the Flemish Region of Belgium. It is the capital and largest city of Antwerp Province, and the third largest city in Belgium by area at 204.51 km2 (78.96 sq mi) after Tournai and Couvin. With a population of 536,079, it is the most populous municipality in Belgium, and with a metropolitan population of over 1,200,000 people, the country's second-largest metropolitan region after Brussels.