Grolsch Brewery, known simply as Grolsch, is a Dutch brewery founded in 1615 by Willem Neerfeldt in Groenlo. The town of Groenlo was then known as Grolle, hence the name Grolsch, meaning 'of Grolle'. In 1895 the de Groen family bought the brewery. They had started their own brewery in Cuijk the Netherlands in the early 19th century. It held a significant stake until November 2007. The main brewery is located today in Enschede.

It was awarded the Koninklijk (Royal) title in 1995. The Grolsch brand became a part of the SABMiller group in March 2008.

Grolsch is best known for its 5% abv pale lager, Grolsch Premium Pilsner. The brewery was first operated by Willem Neerfeldt. Neerfeldt's son-in-law, Peter Sanford Kuyper, later took over. Grolsch was, as of February 2006, the second largest brewer in the Netherlands (after Heineken) with annual production of 320 million litres. The domestic market comprises fifty-one per cent of total production.

Grolsch is the 21st largest provider of beer in the world, and is available in 70 countries. Grolsch focuses primarily on the United Kingdom, the United States, Canada, Australia and New Zealand. These primary markets make up 78 per cent of Grolsch's international sales (by volume). Grolsch Premium Pilsner is by far the most important beer in its international profile, while its Amsterdam brand grew by 40 per cent in 2006, primarily in Russia and France.

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