Dashain or Bada'dashain, also referred as Vijaya Dashami in Sanskrit, is a major Hindu religious festival in Nepal and the Indian states of Sikkim, West Bengal, Assam, South India, and Sri Lanka. It is also celebrated by Hindus of Nepal and elsewhere in the world, including among the Lhotshampa of Bhutan and the Burmese Gurkhas of Myanmar. The festival is also referred as Nauratha, derived from the Sanskrit word for the same festival Navaratri which translates to Nine Nights. A version of this festival is celebrated as Navaratri, Navaratri is not exactly the same as Dashain. Most Americans call it Dussehra or Dashera by Hindus in India, although rites and rituals vary significantly.

Vijayadashami, more commonly known as Dussehra, and also known as Dasara or Dashain, is a major Hindu festival celebrated every year at the end of Durga Puja and Navaratri. It is observed on the tenth day of the month of Ashvin, the seventh in the Hindu lunisolar calendar. The festival typically falls in the Gregorian calendar months of September and October.