Holi (Hindi: होली, Nepali: होली) is a religious spring festival celebrated by Hindus as a festival of colours.

It is primarily observed in India and Nepal. It is also observed by the minority Hindus in Bangladesh and Pakistan as well in countries with large Indic diaspora populations following Hinduism, such as Suriname, Malaysia, Guyana, South Africa, Trinidad and Tobago, the United Kingdom, the United States, Mauritius, and Fiji.

Holi is also known as Phagwah (Assamese: ফাকুৱা), Festival of Colours, or Doḷajātra (Oriya: ଦୋଳଯାତ୍ରା) in Odisha, and as Dol Jatra (Bengali: দোলযাত্রা) or Basantotsav ("spring festival") (Bengali: বসন্তোৎসব) in West Bengal and Assam.

Holi is of particular significance in the Braj region, which includes locations traditionally connected to the Lord Krishna: Mathura, Vrindavan, Nandagaon, and Barsana, which become tourist destinations during the season of Holi.

As per the Hindu calendar, Holi is celebrated on the Phalgun Purnima which comes in February or March in the Gregorian Calendar.

According to this belief, Hiranyakashipu's own son, Prahlada, was a devotee of Vishnu. In spite of several threats from Hiranyakashipu, Prahlada continued offering prayers to Vishnu. He was poisoned by Hiranyakashipu, but the poison turned to nectar in his mouth. He was ordered to be trampled by elephants yet remained unharmed. He was put in a room with hungry, poisonous snakes and survived. All of Hiranyakashipu's attempts to kill his son failed. Finally, he ordered young Prahlada to sit on a pyre in the lap of Holika, Hiranyakashipu's demoness sister, who also could not die because she had a boon preventing her from being burned by fire. Prahlada readily accepted his father's orders, and prayed to Lord Vishnu to keep him safe. When the fire started, everyone watched in amazement as Holika burnt to death, while Prahlada survived unharmed. The salvation of Prahlada and burning of Holika is celebrated as Holi.

In Mathura, where Krishna grew up, the festival is celebrated for 16 days (until Rangpanchmi) in commemoration of the divine love of Radha for Krishna. The festivities officially usher in spring, the celebrated season of love.

Every year, thousands of Hindus participate in the festival Holi. The festival has many purposes. First and foremost, it celebrates the beginning of the new season, spring. Originally, it was a festival that commemorated good harvests and the fertile land. Hindus believe it is a time of enjoying spring's abundant colors and saying farewell to winter. It also has a religious purpose, commemorating events present in Hindu mythology. Although it is the least religious holiday, it is probably one of the most exhilarating ones in existence. During this event, participants hold a bonfire, throw colored powder at each other, and celebrate wildly.

Rangapanchami occurs a few days later on a Panchami (fifth day of the full moon), marking the end of festivities involving colors.

The main day, Holi, also known as Dhuli in Sanskrit, or Dhulheti, Dhulandi or Dhulendi, is celebrated by people throwing scented powder and perfume at each other. Bonfires are lit on the eve of the festival, also known as Holika Dahan (burning of Holika) or Chhoti Holi (little Holi), after which holika dahan prayers are said and praise is offered. The bonfires are lit in memory of the miraculous escape that young Prahlad accomplished when Demoness Holika, sister of Hiranyakashipu, carried him into the fire. Holika was burnt but Prahlad, a staunch devotee of god Vishnu, escaped without any injuries due to his devotion. Holika Dahan is referred to as Kama Dahanam in South India.

In most areas, Holi lasts about two days. Holi lowers (but does not remove completely) the strictness of social norms, which includes gaps between age, gender, status, and caste. Together, the rich and poor, women and men, enjoy each other’s presence on this day. No one expects polite behavior; as a result, the atmosphere is filled with excitement, fun and joy.

Though there have been references in Sanskrit texts to similar festivals, like ratnavali where people sprayed coloured waters using bamboo syringes, the origin of the modern Holi festival has been traced to ancient Bengal. It was a Gaudiya Vaishnav festival, in accordance to Vaishnaviya Tantra. People went to Krishna temples, applied red color to the icon and then distributed the red coloured powder or Abir along with malpua prasad to family and friends. Red signified the colour of passion and Lord Krishna is the king of desires. The ritual signified that all our desires should be diverted for the attainment of Krishna and for the well being of society.

In some cultures though, the ritual of burning wood and leaves on the full moon night already existed. This ritual was to signify the end of winter and full advent of spring. Old wood and leaves that had fallen were burnt to signify that it was time for new leaves and flowers. People then smeared their bodies with ash. Later, however, the story of Holika Dahan became associated with this ritual.

Holi festival is celebrated in Sirsi town with a unique folk dance which has a legend of 300 years. The folk dance called “Bedara Vesha” (Hunters Dance) is performed during the nights beginning five days before the festival day. The festival is celebrated every alternate year in the town which attracts a large crowd on all the five days from different parts of the State.Nearly 50 solo artistes perform the dance with a troupe of drum beaters, whistle blowers and the like.