Ouley Hill is a 186-metre summit located in the Belfast Hills within the townland of Ouley, County Down, Northern Ireland, between Carryduff and Saintfield. The hill has a prominence of 110 metres and is classified as a HuMP. The summit area consists of pastureland near a quarry fence and lacks a distinct summit marker. The townland of Ouley, covering 225.8 acres, derives its name from the Irish Baile Eochaille, meaning "townland of the yew-wood," or Eochoillidh, meaning "yew wood." It lies within the civil parish of Saintfield and the historic barony of Castlereagh Upper. Ouley Hill is accessible via Killinure Road, which crosses its highest point, with additional access from surrounding roads including Ouley Road. Its parent peak is Slieve Croob, and it is mapped at grid reference J382625.