Codrii Vlăsiei was an old-growth forest that once covered parts of southern Romania, including the territory of today's Bucharest and the surrounding Ilfov County.
Codrii means "forests" in the Romanian language, while Vlăsiei is the genitive form of Vlăsia, the Slavic denomination for Wallachia.
In 1456, Vlad Țepeș defeated his rival Vladislav Dan at Târgșor at the edge of Codrii Vlăsiei.
Between 1692 and 1700, a paved road which linked the centre of Bucharest to the Mogoșoaia Palace of Constantin Brâncoveanu was built through the forest.
Of the old forests only a few small areas remain, mostly north of Bucharest, in localities such as Snagov, Pustnicu, Cernica, Romanești and Comana.