RB Omiya Ardija

RB Ōmiya Ardija
RB大宮アルディージャ
Full nameRB Ōmiya Ardija
NicknamesReddoboru (Red Bulls) (current)
Risu (Squirrels) (former)
Founded1969 (1969) as NTT Kantō SC
2024 (2024) as RB Ōmiya Ardija
StadiumNACK5 Stadium Ōmiya
Omiya-ku, Saitama, Saitama
Capacity15,491
OwnerRed Bull GmbH
ChairmanMasashi Mori
ManagerYuki Miyazawa
LeagueJ2 League
2025J2 League, 6th of 20
Websiterbomiya.com

RasenBallsport Omiya Ardija or RB Ōmiya Ardija (RB大宮アルディージャ, Arubi Ōmiya Arudīja) is a Japanese professional association football club based in Ōmiya, Saitama Prefecture. Its "hometown" (as designated by the league) is shared with neighbours Urawa Red Diamonds. The team currently play in J2 League, the Japanese second tier of professional football, after promotion from the third tier in 2024.

The club was known as Ōmiya Ardija (大宮アルディージャ, Ōmiya Arudīja), before club administration was taken over by Red Bull GmbH in late November 2024 who renamed the club.