The Abbey Barn in Preston Plucknett, Yeovil, Somerset, England was built around 1420 by John Stourton (died 1438), in conjunction with the Abbey Farm House. It has been designated as a Grade I listed building, and Scheduled Ancient Monument.

With an internal length of 31.4 metres (103 ft), it is the longest barn in Somerset.

It is now used as a building contractors showroom and store.

• List of Grade I listed buildings in South Somerset