Ludwig von Weltzien | |
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| Native name | Peter Friedrich Ludwig von Weltzien |
| Born | 1 April 1815 Bockhorn, Grand Duchy of Oldenburg |
| Died | 16 October 1870 (aged 55) Wiesbaden, Duchy of Nassau, North German Confederation |
| Allegiance |  Oldenburg North German Confederation |
| Branch | Oldenburg Contingent Prussian Army |
| Years of service | 1829–1870 |
| Rank | Lieutenant General |
| Commands | Oldenburg-Hanseatic Brigade 15th Division |
| Battles/wars | First Schleswig War Austro-Prussian War |
| Awards | Wilhelmsorden House and Merit Order of Peter Frederick Louis Order of the Red Eagle Iron Cross |
Peter Friedrich Ludwig von Weltzien was an Oldenburg-Prussian lieutenant general who served in the Austro-Prussian and Franco-Prussian wars.