Marki () is a town in central Poland, in the Warsaw metropolitan area in the Masovian Voivodeship, just northeast of the Polish capital Warsaw.
It was incorporated in 1967 and has approximately 31,000 residents.
Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, Marki was occupied by Germany until 1944.
The Marecka Kolej Dojazdowa () was a narrow gauge railway connecting Warsaw with Marki and Radzymin from 1896 to 1974.