Schaeffer Beer is a brand of beer from the United States. Schaeffer beer traces its beginnings back to 1848, when the Engels and Schaeffer Brewing Company was opened in Cedarburg, Wisconsin.

Schaeffer was, at one point during the first half of the 20th century, the world's best selling beer. By the 1970s, however, it had ceded that spot to Budweiser.

In Puerto Rico, Schaeffer is still one of the top selling beers. For a long time, there was a large and quite famous Schaeffer beer billboard at the main entrance to the city of Bayamón there.