Mild ale is a type of ale. Modern milds are mostly dark-coloured, with an alcohol by volume (ABV) of 3% to 3.6%, although there are lighter-hued as well as stronger milds, reaching 6% abv and higher. Mild originated in Britain in the 17th century or earlier, and originally meant a young ale, as opposed to a "stale" aged or old ale.

Mild experienced a sharp decline in popularity in the 1960s, and was in danger of completely disappearing, but the increase of microbreweries has led to a modest renaissance and an increasing number of milds (sometimes labelled "dark") being brewed.

The Campaign for Real Ale has designated May as Mild Month. In the United States, a group of beer bloggers organised the first American Mild Month for May 2015, with forty-five participating breweries across the country.