Thorn tree
Thorn tree may refer to:

 The common name for several species of trees in tropical or temperate climates that have spiky, thorn-like leaves, e.g. the Acacia and the boxthorn (Lycium)
 Thorntree, a housing estate in the town of Middlesbrough, in North East England
 A long-running travel-related discussion forum on the Web site of Lonely Planet.