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 , it is the longest barn in Somerset.
It is now used as a building contractors showroom and store.
See also List of Grade I listed buildings in South Somerset
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