A wooden beer-fermenting vat in London burst, destroying a second vat and causing a large flood of at least 128,000 imperial gallons (580,000 l; 154,000 US gal) of porter that killed eight people.

The London Beer Flood was an accident at Meux & Co's Horse Shoe Brewery, London, on 17 October 1814. It took place when one of the 22-foot-tall (6.7 m) wooden vats of fermenting porter burst. The escaping liquid dislodged the valve of another vessel and destroyed several large barrels: between 128,000 and 323,000 imperial gallons of beer were released in total.

Porter is a style of beer that was developed in London in the early 18th century. It is well-hopped and dark in appearance owing to the use of brown malt. The name is believed to have originated from its popularity with porters.