The Urawa Red Diamonds , colloquially Urawa Reds, also known as Mitsubishi Urawa Football Club from April 1992 to January 1996, are a professional football club in the city of Saitama, part of the Greater Tokyo Area in Japan. The club plays in the J1 League, the top tier of football in the country. Its name comes from the former city of Urawa, now part of Saitama.

Saitama is the capital and largest city of Saitama Prefecture, Japan. Its area incorporates the former cities of Urawa, Ōmiya, Yono and Iwatsuki. It is a city designated by government ordinance. As of 1 February 2021, the city had an estimated population of 1,324,854, and a population density of 6,093 people per km². Its total area is 217.43 square kilometres (83.95 sq mi).