Lein

Lein may refer to:

People with that name

 * Allen Lein (1913–2003), American endocrinologist and medical school professor
 * Anatoly Lein (1931–2018), Soviet-born American chess Grandmaster
 * Lars O. Lein (1874–1958), American farmer and politician
 * Simonetta Lein (born 1983), Italian-American columnist and model

Other

 * Lein (Neckar), a river of Baden-Württemberg, Germany, tributary of the Neckar
 * Lein (Kocher), a river of Baden-Württemberg, Germany, tributary of the Kocher
 * Forbregd/Lein, two small adjoining villages in the municipality of Verdal in Trøndelag county, Norway
 * Leiningen (software), the command lein is used for this packaging software