The Penshaw Monument (officially the Earl of Durham's Monument) is a memorial in the style of an ancient Greek temple on Penshaw Hill in the metropolitan borough of the City of Sunderland, North East England. It is located near the village of Penshaw, between the towns of Washington and Houghton-le-Spring in historic County Durham. The monument was built between 1844 and 1845 to commemorate John Lambton, 1st Earl of Durham (1792–1840), Governor-General of British North America and author of the Durham Report on the future governance of the American territories. Owned by the National Trust since 1939, it is a Grade I listed structure.

The monument was designed by John and Benjamin Green and built by Thomas Pratt of Bishopwearmouth using local gritstone at a cost of around £6000; the money was raised by subscription. On 28 August 1844, while it was partially complete, its foundation stone was laid by the 2nd Earl of Zetland in a Masonic ceremony which drew tens of thousands of spectators. Based on the Temple of Hephaestus in Athens, it is a tetrastyle temple of the Doric order, with eighteen columns—seven along its longer sides and four along its shorter ones—and no roof or cella (inner chamber).

One column contains a spiral staircase leading to a parapeted walkway along the entablature. This staircase was closed to the public in 1926 after a 15-year-old boy fell to his death from the top of the monument. The structure fell into disrepair in the 1930s and was fenced off, then repaired in 1939. It has since undergone further restoration, including extensive work in 1979 during which its western side was dismantled. Floodlit at night since 1988, it is often illuminated in different colours to mark special occasions. The National Trust began to offer supervised tours of the walkway in 2011.

Penshaw Monument is a local landmark, visible from up to 80 kilometres (50 mi) away. It appears on the crest of Sunderland A.F.C. and is viewed nationally as a symbol of the North East. It has been praised for the grandeur, simplicity and symbolic significance of its design, especially when seen from a distance. However, critics have said it is poorly constructed and lacks purpose; nineteenth-century architectural journals condemned its lack of a roof and the hollowness of its columns and walls. It features no depiction of the man it honours, and has been widely described as a folly.

Penshaw Monument stands on the south-western edge of the summit of Penshaw Hill, an isolated 136-metre (446 ft) knoll formed by the erosion of an escarpment of the Durham Magnesian Limestone Plateau. The National Trust landholding at the site totals 18 hectares (44 acres), including 12 hectares (30 acres) of deciduous woodland to the west of the monument. The woodland is split into Dawson's Plantation in the north and Penshaw Wood in the south. Both the summit of the hill and the woodland are considered Sites of Nature Conservation Interest by Sunderland City Council.

The monument's car park is accessible from Chester Road (the A183); three footpaths lead from the car park to the monument, which can also be reached from Grimestone Bank in the north-west and Hill Lane in the south. The National Heritage List for England gives the monument's statutory address as Hill Lane, but Sunderland City Council lists the property as located on Chester Road. There have been few changes to the site since the monument's construction, although signs, fences and floodlights have been added, and footpaths have been improved by the National Trust. There is an Ordnance Survey trig point to the west of the monument.

The site receives over 60,000 visitors every year; people come to visit the monument, admire the views or engage in walking, jogging or photography. The Trust has placed a geocache at the site. The Penshaw Bowl, an Easter egg rolling competition for children, takes place on the hill every Maundy Thursday; this tradition is over a century old. The hill is also popular for Bonfire Night and New Year celebrations.

The surrounding area was formerly industrialised, but is now mainly arable farmland. The site is in the Shiney Row ward; it is south-west of Sunderland, north-east of Chester-le-Street, south-east of Washington and north of Houghton-le-Spring. To the north is the Washington Wetland Centre, managed by the Wildfowl & Wetlands Trust; to the south is Herrington Country Park. The monument is visible from 80 km (50 mi) away on a sunny day and can be seen from the A1 road; from the hill, it is sometimes possible to see the Cheviot Hills in Northumberland and the central tower of Durham Cathedral, as well as the sea.