Haldwani (हल्द्वानी in Hindi, ਹਲਦ੍ਵਾਨੀ in Punjabi) is a city, which along with its twin township of Kathgodam forms the Haldwani-Kathgodam municipal Corporation (since May 2011) in Nainital District in the Indian state of Uttarakhand.

Haldwani is the third most populous city in Uttarakhand (after Dehradun & Haridwar), and is known as the "Gateway of Kumaon". In Kumaoni, the local dialect, the place is called "Halduvani", literally "forest of Haldu", after the tree named "Haldu", often referred to as "Kadamb" (Haldina cordifolia), which was found in abundance prior to deforestation for agriculture and settlement.