Sheosar Lake (Urdu: شیوسر جھیل) is an alpine lake situated at the western end of Deosai National Park, Gilgit-Baltistan, Pakistan. Located at an elevation of 4,250 metres (13,940 ft), the lake is regarded as one of the highest altitude lakes in the world.

The lake is accessible through two routes. One is via Astore and the other via Skardu. From the main Astore town, it takes about four hours' jeep travel through a semi-metal road to reach Chilum, the last residential area adjacent to the plains. The second route, from Skardu, can be covered by jeep in few hours; however, a trek along this route can take two days. During a clear sunny day, Nanga Parbat peak can be seen from the location of the lake.

Between the months of November and May the area of Deosai is snow bound. During spring, the surrounding area is covered with a wide variety of flowers and butterflies.^{[citation needed]} Most visitors come to the lake in the summer, between June and early September.