The River Windrush is a tributary of the River Thames in central England. It rises near Snowshill in Gloucestershire and flows south east for about 65 km (40 mi) via Burford and Witney to meet the Thames at Newbridge in Oxfordshire.

The river gives its name to the village of Windrush in Gloucestershire, and also to the ship HMT Empire Windrush, which carried the first large group of postwar immigrants from the Caribbean to the UK in 1948.

The river is known for its scenic beauty and historical significance, as well as its wildlife and water quality.