Parashar Lake (also spelled Prashar Lake) is a freshwater lake located at an elevation of 2,730 metres (8,960 ft) in the Mandi district of Himachal Pradesh, India. It lies 49 km (30 mi) east of the town of Mandi, and has a three storied pagoda-like temple dedicated to the sage Parashara situated on its bank. It contains a floating island.

The lake was considered sacred by the sage Parashara, who meditated here. The temple was built in the 14th century by Raja Ban Sen of Mandi in honor of the sage and thus, considering the Himachali architecture, the lake was named after him.

The lake is located at an elevation of 2,730 m (8,960 ft) above sea level. With deep blue waters, the lake is held sacred to the sage Parashar and he is regarded to have meditated there. Surrounded by snow-capped peaks and looking down on the fast flowing river Beas, the lake can be approached from Mandi or from Bajaura in Kullu Valley. Both routes are 49 km (30 mi). There is a round, floating island in the lake, which is a common natural phenomenon found all around the world. It is composed of plant matter in various stages of decomposition, and is held afloat by the oxygen in its plants' roots. The floating island moves in all directions in the lake. The floating island covers 7% of the area of the lake.

The temple was built in the thirteenth century and legend has it was built by a baby from a single tree. Until now no one has determined the depth of Prashar Lake. It is said that a diver is not able to determine its depth.

It is believed that Sage Prashar meditated on the banks of this lake, hence it is named Prashar Lake. Bhima, one of the Pandava brothers, had created the lake, the story says. After the Kurukshetra / Mahabharat war, the Pandavas were returning with Lord Kamrunag. When they reached this place, Kamrunag loved the tranquil surroundings and decided to live here forever. So, Bheem (the strongest of the lot) rammed his elbow on one of the mountains and created a big dent in the land. This dent became Prashar Lake.

Prashar Lake is approximately 49 km (30 mi) by road from the town of Mandi. The maximum depth of the lake remains unknown.

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  Prashar Lake and temple, Jan '21
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  Dry winter view of Prashar Lake and temple
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  Prashar Lake frozen and snow-covered, Feb '14.
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  Aerial view, lake in centre, approach road from lower right corner, Feb '18
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  Aerial view, lake and temple in centre, Feb '18
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  Prashar Lake and temple, Nov. '20

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  Thistle plant (Cirsium wallichii)
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  Florets of Thistle (Cirsium wallichii)

• Himachal Pradesh Tourism Department
• "Prashar Temple". DevBhumi. Retrieved 12 July 2023.