Bitburger brewery (Bitburger Brauerei Th. Simon GmbH) is a large German brewery founded in 1817 by Johann Wallenborn.

Bitburger ranks number 3 among Germany's best selling breweries with annual sales of 3.86 million hectolitres in 2008, the best known product being Bitburger Premium Pils.

Johann Peter Wallenborn founded the brewery in Bitburg in 1817 at the age of 33. His father owned a brewery in Kyllburg. Three years after Wallenborn's death in 1839 Ludwig Bertrand Simon married into the family business and became owner of the brewery, naming it Simonbrau. His son, Theobald Simon, took over the brewery in 1876 at the age of twenty-nine.

The company slogan is, "Bitte ein Bit." This is literally, "Please, a Bit," or "a Bit, please." In the 1970s a second slogan was introduced, "Abends Bit, morgens fit" ("Bit in the evening, fit in the morning") implying that the consumption wouldn't lead to a hangover. During that time either of the slogans could be found on Bitburger glasses.

Bitburger is a 4.8% abv Pilsner with annual sales of 1.2 million hectolitres. The popularity of Bitburger extends beyond the local area of Bitburg. Although Germans generally prefer local breweries, it is a popular beer throughout Western Germany, and is favored in many areas of North Rhine Westphalia even over Alt beer or Kölsch, which are popular in Düsseldorf and Köln.