The Full Form of DNH is Dadra and Nagar Haveli.

Dadra and Nagar Haveli (/ˈdɑːdrɑː … ˌnʌɡər həˈvɛli/; Portuguese: Dadrá e Nagar-Aveli) is a region in western India. It is composed of two separate geographical entities: Nagar Haveli, wedged between Maharashtra and Gujarat and 1 km to the northwest, the smaller enclave of Dadra, which is surrounded by Gujarat. Silvassa is the administrative headquarters of Dadra and Nagar Haveli. Unlike the surrounding areas, Dadra and Nagar Haveli was ruled by the Portuguese from 1783 until the mid-20th century. The area was captured by Pro-India forces in 1954 and administered as the de-facto state of Free Dadra and Nagar Haveli before being annexed to India as a union territory, the Union Territory of Dadra and Nagar Haveli in 1961. The union territory was merged with the neighbouring union territory of Daman and Diu to form the new union territory of Dadra and Nagar Haveli and Daman and Diu on 26 January 2020. The territory of Dadra and Nagar Haveli then became one of the three districts of the new union territory, as the Dadra and Nagar Haveli District.