Omiya Ardija(大宮アルディージャ,Ōmiya Arudīja?) is a professional association football club which play in the J. League Division 2, and are based in Ōmiya-ku in Saitama, Japan. Its "hometown" as designated by the league is the whole of Saitama city, which is shared with neighbours Urawa Red Diamonds. Omiya currently compete in the J2 after relegation in 2014. They competed in J1 2005 and between 2005 and 2014 continued to remain in J1, following promotion from J2 in 2004 as the second placed team.
In 2005-2007 most of Omiya's home matches were held at Saitama Stadium 2002 and Urawa Komaba Stadium due to expansion works at their home ground. In October 2007 the expansion was complete. On November 11, the re-opening match was held as a J. League season match between the Ardija and Ōita Trinita (1-2).