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
{{disambiguation, geo