Friedrich Wilhelm Leopold Pfeil (28 March 1783 – 4 September 1859) was a German forester.
Pfeil was born in Rammelburg.
From 1801 onward, he trained and worked as a forester at several sites in the Harz region, Neuchâtel and Silesia.
As a soldier in the Napoleonic Wars he fought at the Battles of GroĂźbeeren and Wartenburg.
From 1816 he was employed as a forester in the service of Heinrich Karl Erdmann, prince of Carolath-Beuthen.
In 1821 he was awarded an honorary doctorate at the University of Berlin, and despite lacking a university education, was named a professor of forest science.
In 1830 when the department of forestry was relocated to Eberswalde, he was named its director, a position he maintained up until his retirement in 1859.From 1822 to 1859 he was editor of the journal Kritische Blätter für Forst- und Jagdwissenschaft — after his death, Hermann von Nördlinger continued as its editor.
Pfeil died in Warmbrunn.
From 1863 to 2005 the "Wilhelm-Leopold-Pfeil-Preis" was awarded for contributions made towards future forest management in Europe.