Tosson Hill is the highest hill in the Simonside Hills to the south of Rothbury in Northumberland, England. The summit lies about 2 kilometres (1.2 mi) west of Simonside, the best-known summit of the Simonside Hills.
It has an elevation of 441.7 m (1,449 ft) and a prominence of 249.1 m (817 ft) and is classed as a Marilyn. The summit is about 1 kilometre (0.62 mi) west of the edge of the Forestry Commission-owned Simonside Forest, and unlike the rest of the Simonside hills there was no public access to the summit.