The Lidder Valley or Liddar Valley in the state of Jammu and Kashmir, India, is a Himalayan sub-valley that forms the northeastern corner of the Vale of Kashmir.  The Lidder River flows down the valley. The entrance to the valley lies seven km northeast from Anantnag town and 62 km southeast from Srinagar, the capital of Jammu and Kashmir. It is a 40-km-long gorge valley with an average width of 3 km.

The Lidder Valley is situated within the jurisdiction of Pahalgam tehsil, of Anantnag district. It is bordered by Kashmir Valley to the west, and Sind Valley to the north, and covers a length of 40 km. It has a maximum width of five km. The Lidder basin is surrounded on the south and southeast by the Pir Panjal Range, on the north by the Sind Valley and on the northeast by the Zaskar Range. The Lidder drainage basin has an area of 1134 km2. It is formed by the flow of the Lidder River which flows within a Y-shaped valley, upstream of Pahagam the river diverges into the East Lidder and the West Lidder. The East Lidder of which reaches eastwards from Pahalgam up past Chandanwari and flows from east to west starting in the area of Sheshnag Lake and the Shisram Glacier.The West Lidder originates from the Kolhoi Glacier and runs through green coniferous forests through many alpine meadows. The Lidder Valley provides fresh water supply to other districts and irrigation for agriculture. The Lidder River flows through the entire valley passing several natural landmarks and tourist spots, including Aru, Pahalgam, Betab Valley, and Akad. The main towns in the Lidder Valley are Mandlan, Laripora, Phraslun, Ashmuqam and Seer Hamdan.

The Lidder Valley has many glacier-fed streams, and the tributaries of the Lidder River are home to different types of trout. The valley is the natural habitat of the Himalayan black bear. The Himalayan brown bear, musk deer, snow leopard and hangul have also been spotted in the Aru and Lidderwat areas, which are close to Dachigam National Park.