The Col. Sher Jung National Park is a protected area, classified as a National Park under the Wildlife (Protection) Act, 1972, located in the Paonta Valley of the Sirmaur district in Himachal Pradesh. It is also known by its original name, Simbalbara National Park, and is named after the freedom fighter and environmentalist Colonel Sher Jung. The park covers an area of approximately 27.88 square kilometers.
The protected area was first established in 1958 as the Simbalbara Wildlife Sanctuary with an area of 19.03 km². The primary problem it was created to address was the protection of the habitat for the goral, a goat-like animal found in the region. The sanctuary was upgraded and extended to a National Park in 2010 by adding 8.88 km² to its area, with the final notification under the Wildlife (Protection) Act, 1972 being issued in 2013.
As a National Park, it is managed to conserve its rich biodiversity, which includes dense Sal forests and key fauna like the Nilgai, Sambar deer, and spotted deer. The park is ecologically significant as it is situated at the confluence of three biogeographic regions: the Himalayas, the Gangetic plain, and the semi-arid region. It connects to the Kalesar National Park and Kalesar Sanctuary in Haryana, forming a larger interstate conservation unit in the Shivaliks. A recent change involved the Himachal Pradesh High Court quashing a state government notification that had declared an Eco-Sensitive Zone (ESZ) around the park.