Ouley Hill is a 186-metre (610 ft) 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 (Hundred Metre Prominence).
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.