Cannon Hall is a country house museum located between the villages of Cawthorne and High Hoyland some 5 miles (8 km) west of Barnsley, South Yorkshire, England. Originally the home of the Spencer and later the Spencer-Stanhope family, it now houses collections of fine furniture, paintings, ceramics and glassware. It at one time housed the Regimental Museum of the 13th/18th Royal Hussars (Queen Mary's Own) and the Light Dragoons, which has now closed.^[1] Now occupying four rooms in the east wing is the "Family of Artists" exhibition on loan from the De Morgan Foundation, which draws on the links between the Spencer Stanhopes and the De Morgans.^[2]

The building is constructed of coursed sandstone with ashlar dressings with a symmetrical layout of a central 3-storey block of 5 bays and slightly set back 2-storey side wings of 3 bays.^[3]

Although there was a house on the site when the Domesday Survey of 1086 was conducted, Cannon Hall picked up its current name from the 13th-century inhabitant Gilbert Canun. By the late 14th century Cannon Hall was in the ownership of the Bosville family of Ardsley, now a suburb in south-east of Barnsley. It was during this period that the most violent event in Cannon Hall's history took place. The Bosvilles had let the Hall out to a family (whose name has been lost), the daughter of whom was romantically involved with a man named Lockwood. Lockwood had been involved in the murder of Sir John Elland, the High Sheriff of Yorkshire. The tenant, afraid of the position in which he could find himself accommodating a fugitive, sent word to Bosville. Bosville's men arrived at Cannon Hall, where the fugitive was slain in a cruel and violent manner.

Cannon Hall's history settled down after this notably unpleasant episode. In 1660 the estate was purchased by John Spencer, a Welsh hay-rake maker. The Spencer family had arrived in Yorkshire from Montgomeryshire in the Welsh borders, a safer place than Wales for those with Royalist sympathies such as those of the Spencers (John Spencer even managed to get a pardon from Charles II himself when John was held in York prison on manslaughter charges). The Spencer family became active in the local iron and coal industry - notably under John Spencer (died 1729) who took advantage of the death of his partners to establish control.^[4] The family built a huge empire and funding the rebuilding of Cannon Hall.

The core of the present Cannon Hall was built at the opening of the 18th century for John Spencer Stanhope, possibly by John Etty of York, more surely with interior joinery by William Thornton, another well-known local craftsman. It was enlarged with the addition of wings in 1764–67 by the premier mid-Georgian architect working in Yorkshire, John Carr. Subsequently, the wings were heightened, giving the rather high-blocked mass seen today. The last member of the family, Elizabeth, sold the house to Barnsley Council in 1951.

Cannon Hall Museum opened to the public in 1957.^[5]

Cannon Hall Museum, park and gardens is owned and operated by Barnsley Metropolitan Borough Council. The Hall has a programme of events, including the annual Regency Ball, a Christmas Fair each December and guided tours, workshops and children's activities throughout the year. A florist, plant and gift shop has also been recently established in the old potting shed outbuilding next to the walled garden.

• Grade II* listed buildings in South Yorkshire
• Listed buildings in Cawthorne
• Cannon Hall Farm