Bristol & West (B&W) was a former mutual building society in the United Kingdom (UK), one of the first to be demutualised to become a publicly traded bank in 1997.

It offered mortgages in the Bristol and the south west of England area, and became a well-known financial services institution in the region.

[citation needed] By 1996, Bristol & West was the ninth largest building society in the United Kingdom,[6] with 1.1 million customers.

[9] In 2005, eight years after its purchase, the Bank of Ireland sold its Bristol & West plc savings and investment business to the Britannia Building Society for £150 million.

[10] Existing Bristol & West account holders were transferred to a Britannia-branded product,[2] and all branches assumed the Britannia brand identity.