Carl, Prince of Leiningen, KG (Carl Friedrich Wilhelm Emich; 12 September 1804 – 13 November 1856) was the third Prince of Leiningen and maternal half-brother of Queen Victoria.
Leiningen served as a Bavarian lieutenant general, before he briefly played an important role in German politics as the first Prime Minister of the Provisorische Zentralgewalt government formed by the Frankfurt Parliament in 1848.