Berberis aquifolium is a species of flowering plant in the family Berberidaceae. It is an evergreen shrub that typically grows to a height of 1–3 m (3.3–9.8 ft) tall. The plant has yellow flowers that bloom from mid-spring to early summer, followed by blue-black berries in late summer to early autumn. It is native to western North America and is commonly known as Oregon grape, holly-leaved barberry, or mountain grape.