Administered by the Museums, Libraries and Archives Council (MLA) the Museum Accreditation Scheme sets out nationally agreed standards for museums in the UK.
Accredited museums must adhere to published minimum standards in how they care for and document their collections, how they are governed and managed, and on the information and services they offer to their users.

http://www.mla.gov.uk/programmes/accreditation

List of Accredited/Registered Museums

• Athelstan Museum, Malmesbury
• Bradford on Avon Museum
• Castle Combe Museum
• Chippenham Museum and Heritage Centre
• Cricklade Museum
• John Creasey Museum and art collection, Wiltshire Council Collection at Salisbury Library
• Dewey Museum, Warminster
• Fox Talbot Museum, Lacock (National Trust)
• Great Chalfield Manor, Melksham (National Trust)
• Kennet & Avon Canal Museum, Devizes
• Alexander Keiller Museum, Avebury (National Trust)
• Lackham Agricultural Museum
• Lacock Abbey (National Trust)
• Little Clarendon, Dinton, Salisbury (National Trust)
• Lydiard House and Park, Swindon
• Mere Museum
• Market Lavington Museum
• Mompesson House, Salisbury (National Trust)
• Pewsey Heritage Centre
• Philipps House, Dinton, Salisbury (National Trust)
• Purton Museum
• Redcoats in the Wardrobe, Salisbury
• ** Salisbury and South Wiltshire Museum
• *** Science Museum, Wroughton
• Steam – Museum of the Great Western Railway, Swindon
• Stourhead, Stourton (National Trust)
• Swindon Museum and Art Gallery
• Trowbridge Museum
• ** Wiltshire Heritage Museum, Devizes
• Edwin Young Art Collection, Wiltshire Council collection at Salisbury Library

Key
** - accredited museum with designated collections of national importance
*** - national museum outstation