Mahou is a brand of beer brewed by the Spanish brewer Mahou-San Miguel Group. The Mahou brewery was founded in Madrid in 1890. Its most popular beer is Mahou 5 Estrellas (Mahou 5 Stars).

Mahou was born in parallel to the modernization of Spanish society in the 19th century. Mahou is a Spanish beer that belongs to the Mahou-San Miguel group, one of the main beer companies of the country in the 21st century. The brand name refers to the surname of the family that owned the brewery for more than a century. The beginning of this beer's history traces back to 1890 and its creator Casimiro Mahou Beirhans, an entrepreneur of German origin that decided to found the family company El ARCO Iris which would later become the pioneer company in Spain for beer production.

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