Yarnbrook is a large hamlet in Wiltshire, England, between the towns of Westbury and Trowbridge.

Most of the settlement lies in the civil parish of North Bradley, the rest in West Ashton.

Most of Yarnbrook's houses line the A350 road, running between the M4 motorway near Chippenham and the south coast of England at Poole, Dorset.

[2] The first edition of the Andrews and Dury map of Wiltshire (1773) shows only Bradley Mill and a few other houses at Yarnbrook.

[3] The hamlet grew up around a crossroads where what is now the A350 meets the A363 and where a pub, now called the Longs Arms and Hungry Horse, was built in 1803.