The Tarsar Lake or Tar Sar is an almond-shaped, oligotrophic alpine lake situated in the Kashmir Valley, specifically in Aru, Anantnag district, Jammu and Kashmir, India.

The Tarsar Lake is accessible only during the summer; during the winter, the treks are closed because of the heavy snowfall. It can be reached from Srinagar, via a 102 km motorable road which leads through Anantnag and Pahalgam to the Aru trekking camp. The alpine meadow of Lidderwat lies at the halfway point of the two-day trek to the lake. An alternate route leads through Ganderbal and a trekking starting point at Sumbal in the Sind Valley. Due to the steepness of the trek, it is preferable to approach the lake by the Aru-Lidderwat trek and return via the Sumbal-Sind Valley trek.Another accessible route to Tarsar and Marsar is a Place called Nage-Baren via Tral.