RB Omiya Ardija

RB Ōmiya Ardija
RB大宮アルディージャ
Full nameRB Ōmiya Ardija
Nickname(s)Reddoburu (Red Bull)
Founded1969 (1969) as NTT Kantō SC
StadiumNACK5 Stadium Ōmiya
Omiya-ku, Saitama, Saitama
Capacity15,491
OwnerRed Bull GmbH
ChairmanMasashi Mori
ManagerTetsu Nagasawa
LeagueJ2 League
2024J3 League, 1st of 20 (promoted)
Websitewww.rbomiya.com

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.