Alexander Keith's is a brewery in Halifax, Nova Scotia, Canada. It is part of Anheuser-Busch InBev, a holdings company based in Leuven, Belgium, which owns over 400 beer brands globally.

The brewery was founded in 1820 by Alexander Keith who had immigrated from Scotland three years previously.^[1] In 1928, the business was sold to Oland Brewery, which was in turn sold to the Labatt Brewing Company. Following a number of mergers and acquisitions, the brand is now part of Anheuser-Busch InBev.^[2]

Since 1928, parent companies kept the brand alive, and by the 1990s Alexander Keith's India Pale Ale was the most popular beer in Nova Scotia.^[3] A number of other styles is also marketed. Although Alexander Keith products were originally produced in the Halifax brewery only for sale in the Maritimes, they are now produced at Anheuser-Busch InBev plants across Canada and America.

Archived recipes for beer made by the Alexander Keith's Brewery in the early 1900s show high levels of hopping, with large all-malt mash ingredients and no use of corn, typical for beers of that time.^[4] In contrast, the modern beer marketed as Alexander Keith's IPA is only 5% alcohol by volume and lightly hopped, which does not meet the accepted criteria for an IPA.^[5] At the 2016 Canadian Brewing Awards, Alexander Keith's IPA won third place, not in the IPA category, but in the "North American Style Blonde or Golden Ale" category.^[6]