Sycamore Gap Tree, Tree landmark at Hadrian's Wall, England

The Sycamore Gap Tree was a sycamore (Acer pseudoplatanus) about 15 m tall, growing in a dip in the Whin Sill cliff between Milecastle 39 and Crag Lough, with Hadrian's Wall running along the ridge on either side. It was felled in 2023 and survives as a stump throwing up basal shoots.

The sycamore was planted in the late 19th century by Newcastle lawyer John Clayton (1792–1890) as a landscape feature. Clayton excavated Hadrian's Wall for nearly 50 years and bought five forts and about 20 miles of the wall to protect it from stone robbers. A tree in the gap was already sketched by John Hodgson on 18 October 1832.

The tree became widely known after appearing in the 1991 Robin Hood film, drawing visitors interested in the movie's locations. Its image became closely linked to the landscape of Hadrian's Wall for travelers worldwide.

The location sits along the 84-mile Hadrian's Wall hiking route and is reachable via established walking paths. The area is equipped for hikers and offers straightforward access to the site during a longer walking journey.

The tree won the 2016 England Tree of the Year contest with 2,542 of 11,913 votes, and the £1,000 grant went to surveying its health and protecting roots worn bare by foot traffic. It came fifth of 16 in the 2017 European Tree of the Year with 7,123 votes.