A London Bar is a gold bar meeting the London Good Delivery Standards. Also known as a London Good Delivery Bar.

The specifications for Good Delivery Bars include:

• A minimum gold content of 350 troy ounces;
• A maximum gold content of 430 troy ounces; and
• A minimum fineness of 995.0 parts per thousand fine gold.

Complete specifications are available from the London Bullion Market Association.