The Castlemaine Brewery was an Australian brewery and brewing company established in 1857 by Edward Fitzgerald. He was joined in the business by his brother Nicholas Fitzgerald in 1859, after which the firm spread rapidly, opening breweries in Melbourne, Newcastle, Sydney and Brisbane, along with smaller breweries at Daylesford and Newbridge. The breweries, though all originating from the same brothers, were either established or later floated as separate companies with distinct histories thereafter, even though the brothers retained a stake in them.