Omiya Ardija trace their roots to 1969, when a football section was established in Urawa, Saitama Prefecture, under the name Denden Kanto Soccer Club, connected to the national telecommunications company NTT. The club was separately incorporated in 1998, relocated to the city of Omiya, and adopted the name Ardija — taken from the Spanish word ardilla, meaning squirrel, the beloved symbol of Omiya's parkland setting. The following year they entered the J.League as one of eight newly admitted clubs.
The club spent their early J.League years in the second division before earning promotion to J1 in 2004. Their longest top-flight spell ran from 2005 to 2014, a period in which compact, counter-attacking football became a hallmark of the side. Their finest single season came in 2016, when they finished fifth in J1, the highest position in the club's history. They have claimed one J2 League title (2015) and one J3 League title (2024).
Late 2024 brought a landmark change in ownership: Austrian energy drink company Red Bull GmbH acquired 100% of the club's shares — the first time a foreign company had taken sole ownership of a major Japanese professional sports team — and the club was renamed RB Omiya Ardija. The rebrand aligned them with Red Bull's global network of clubs including RB Leipzig, Red Bull Salzburg, and New York Red Bulls.
On the pitch, Omiya are defined by their rivalry with Urawa Red Diamonds, a fellow Saitama club with whom they share the Saitama Derby. Competing in J2 as of 2025, the club enters a new chapter under one of world football's most ambitious multi-club ownership structures.