| Leopold IV | |
|---|---|
 | |
| Prince of Lippe | |
| Reign | 25 October 1905 – 12 November 1918 |
| Predecessor | Alexander |
| Successor | Monarchy abolished |
| Born | 30 May 1871 Oberkassel |
| Died | 30 December 1949 (aged 78) Detmold |
| Spouse | Princess Bertha of Hesse-Philippsthal-Barchfeld Princess Anna of Ysenburg and Büdingen |
| Issue | Armin, Prince of Lippe |
| House | House of Lippe |
| Father | Ernest, Count of Lippe-Biesterfeld |
| Mother | Countess Karoline of Wartensleben |
Leopold IV, Prince of Lippe (Leopold Julius Bernhard Adalbert Otto Karl Gustav; 30 May 1871 – 30 December 1949) was the final sovereign of the Principality of Lippe in northwestern Germany from 1905 until his abdication in 1918. Prior to succeeding to the throne, he had been governing the state since 1904 as regent. He was the first and only ruler of Lippe of the Lippe-Biesterfeld branch.