Ovan lake (also known as Evan Lake) () is a small alpine lake in the Alamut region of the Alborz mountain range, in Qazvin province of Iran. The centre point of the lake is approximately located at . The only tributary that flows into the lake, is a stream with the same name, Ovan, coming down from northern mounts. The north of the lake is surrounded by three small villages, namely from east to west: Varbon, Avan and Zarabad.