Berberis trifoliolata is a species of flowering plant in the family Berberidaceae, native to the southwestern United States and northern Mexico. It is a deciduous shrub that typically grows to 1-3 m (3-10 ft) tall and wide. The leaves are trifoliate, with each leaflet up to 5 cm (2 in) long and 2 cm (0.8 in) wide. The flowers are yellow, and the fruit is a red berry.