The Tumbling Weir is a circular weir in the town of Ottery St. Mary, Devon, England that allows water from a leat or man-made stream to reach the River Otter.

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It is apparently a rare design in that the water enters through a circular opening at the top that is surrounded by the stream. The water then cascades down some more smaller rings until it enters a culvert which enters a tunnel under the nearby path before sluicing down to the river a few metres away.

Today^[when?] the mill site and the adjoining factory is unoccupied, awaiting re-development. Near the site is the Tumbling Weir Hotel, a converted 17th century thatched house, now a popular hotel and restaurant.

Wikimedia Commons has media related to Tumbling Weir, Ottery St Mary.

• Nigel Sadler (15 February 2013). Ottery St Mary Through Time. Amberley Publishing Limited. pp. 104–. ISBN 978-1-4456-2986-5.

50.75055°N 3.28474°W / 50.75055; -3.28474