Brasserie Castelain is a regional French brewery located in Benifontaine, in the Nord-Pas-de-Calais region of northern France. The brewery has been producing beer since at least 1979 and played a meaningful role in the revival of French specialty brewing during the 1970s and 1980s, alongside other regional producers such as Brasserie St. Sylvestre and Brasserie Duyck. Situated close to the Belgian border, Castelain draws on a rich brewing tradition rooted in the distinct beer culture of northern France. The brewery is best known for its bières de garde, a traditional French style that is bottle-conditioned and characterised by its malty depth and warm fermentation character. Castelain's portfolio includes a range of beers under the CH'TI label, a name that refers to the local dialect of the region. The CH'TI Blonde, brewed at 6.8% ABV, is the brewery's flagship beer, described as golden in colour with floral notes, hints of honey and a smooth finish. The Grand Cru is a stronger expression, a Strong Blonde Ale reaching 8.5% ABV. Brasserie Castelain is recognised internationally as one of the key producers in the bière de garde market and has attracted visitors through its brewery experience in Benifontaine. The site is listed as a tourist attraction in the Pas-de-Calais region and is noted for its gardens. The brewery's address is 13, rue Pasteur, Benifontaine.