The Westmill Wind Farm which is an onshore wind farm near the village of Watchfield in the Vale of White Horse, England. It has five 1.3 MW wind turbines erected in a line along the disused runway of the former RAF Watchfield. The wind farm has a power output of up to 6.5 MW, projected to produce enough electricity in a year to supply more than 2,500 homes.

The wind energy cooperative was established in 2004 and has more than 2,000 members. The wind farm is intended to help to reduce dependence on fossil fuels whose emissions are considered to contribute to climate change. In 2007 Westmill Wind Farm Co-operative received a Schumacher Award.

Westmill Wind Farm was promoted by Energy4All, a co-operative founded by Baywind Energy Co-operative, which is a pioneer of co-operative wind energy in the UK.