The Great Western Ambulance Service NHS Trust (GWAS) was a National Health Service (NHS) trust which provided emergency and non-emergency patient transport services to Bath and North East Somerset, Bristol, Gloucestershire, North Somerset, Swindon and Wiltshire, in South West England. It was formed on 1 April 2006 by the merger of the Avon, Gloucestershire and Wiltshire ambulance services. The ambulance service was acquired by neighbouring Foundation Trust South Western Ambulance Service (SWASFT) on 1 February 2013.

The South Western Ambulance Service NHS Foundation Trust (SWASFT) is the organisation responsible for providing ambulance services for the National Health Service (NHS) across South West England. It serves the council areas of Bath and North East Somerset, Bournemouth, Christchurch and Poole Council, Bristol, Cornwall, Devon, Dorset, Gloucestershire, North Somerset, Plymouth, Isles of Scilly, Somerset, South Gloucestershire, Swindon, Torbay and Wiltshire.