Stepin Lug (Serbian: Степин Луг) or Gaj (Serbian: Гај) is a park-forest and, for the most part, non-residential suburban settlement of Belgrade, the capital of Serbia. It is located in Belgrade's municipalities of Voždovac (southern part) and Zvezdara (northern part). It is part of the forest complex Stepin Lug-Baba Velka-Torlak-Jajinci, which is the largest wooden area in Belgrade.