Piétrain is a breed of domestic pig native to Wallonia, which takes its name from "Piétrain", a small village of the Walloon municipality of Jodoigne. This breed became popular in the 1950s during the difficult period of the swine market in 1950-51. Piétrain swine were imported into Germany in 1960-61. The main breeding areas in that country are Schleswig-Holstein, Nordrhein-Westfalen, and Baden-Württemberg. They are commonly used in crossbreeding in Germany to improve the quality of pork produced.
The breed was improved by researchers at the Université de Liège in 2004.