Clun is a small town in southwestern Shropshire, England, and the Shropshire Hills Area of Outstanding Natural Beauty. The 2011 census recorded 680 people living in the town. Research by the Campaign for the Protection of Rural England suggests that Clun is one of the most tranquil locations in England.

Clun takes its name from the river upon whose banks it stands. Deriving from the earlier Colunwy, it shares its very early British root with the two rivers Colne, in Lancashire and Essex, each of which has a town of the same name on its banks.

Clun grew up around the site of a Saxon church towards the end of the 7th century AD. However, in the surrounding area there was a scattered population at least as early as the Neolithic period, about 5000 years ago. Clun was on the historic drove road where flocks and herds were driven from Wales to the markets in the Midlands and London. At the time of the Norman Conquest Clun formed part of the extensive lands of Eadric the Wild, who led a revolt against King William I, whereon his lands were confiscated and given to Roger de Montgomery who was created Earl of Shrewsbury. Roger in turn granted 27 manors, of which Clun was the largest, to Picot de Say. These lands constituted a single Marcher Lordship which became known as the Barony of Clun.

The Normans established a borough near the castle; the typical grid pattern is still visible in the layout of High Street, Newport Street, Kidd Lane, Powell's Lane, Ford Street and Hospital Lane.

The 14th-century pack horse bridge that crosses the river connecting Saxon Clun to Norman Clun has given rise to a local saying: "whoever crosses Clun Bridge comes back sharper than he went".

Clun Mill located to the north of the town is nicknamed the "malevolent mill" on account of numerous deaths having been recorded there and occupants disappearing after purchasing it. Last used around 1920, it opened as a youth hostel in 1932. In 1974 the freehold was purchased by the Youth Hostel Association.

Attractions in the town include:

• the Norman Clun Castle, now only a ruin but with grounds which are used for the May fair
• the fifteenth century Clun Bridge (basically a packhorse bridge), most of which is still the original stone despite being a road bridge today used by all vehicles
• Trinity Hospital, almshouses built in 1614, on Hospital Lane
• a museum in the Town Hall, on the corner of The Square and High Street

The main church in the town is St George's Church, which is situated on the steep rise out of the town ("Church Street") to the south of Clun Bridge. The nave includes Norman columns, but the entire church apart from the tower was rebuilt extensively by the Victorian architect G. E. Street in 1877.

Clun is a popular starting point for walkers who wish to explore the Shropshire Way, the Jack Mytton Way or the local circular walks. A walkers' car park is situated at the Memorial Hall.