Leiningen

 Leiningen may refer to:


 * Leiningen, Germany
 * Principality of Leiningen (former country; 1803-1806)
 * House of Leiningen
 * Leiningen, the protagonist of the 1938 short story, "Leiningen Versus the Ants" by Carl Stephenson
 * Leiningen (software), a build automation tool for the Clojure programming language