Dos Equis is a pale lager that was originally brewed by the German brewer Wilhelm Hasse in 1897. The brand was named "Siglo XX" ("20th century") to commemorate the arrival of the new century, and the bottles were marked with the Roman numerals "XX", or "Dos Equis" (two Xs).

The main brand Dos Equis XX Special Lager is a 4.45% abv pale lager sold in green bottles. Dos Equis XX Amber is a 4.7% Vienna-style amber lager sold in brown bottles, and was first exported to the United States in 1973.