Unaizah (Arabic: عنيزة ʿUnaizah) or officially The Governorate of Unaizah (also spelled Onaizah, Onizah, or Unayzah; Arabic: محافظة عنيزة Muḥāfiẓat ʿUnaizah) is a Saudi Arabian city in the Al Qassim Province. It lies south of the province capital Buraydah and north of Riyadh, the capital of the Kingdom of Saudi Arabia. It is the second largest city in Al-Qassim Province with a population of 163,729 (2010 census).