Trendle Ring (or Trundle Ring) is a late prehistoric earthwork on the Quantock Hills near Bicknoller in Somerset, England. It is a Scheduled Ancient Monument (Site no. 33201). In 2013 it was added to the Heritage at Risk register due to vulnerability to plant growth.The word trendle means circle, so it is a tautological place name.The site, which covers 0.8 hectares (2.0 acres), is surrounded by a single rampart with a ditch and has a simple opening on the East, uphill side.