Holi (IPA: ['hoːli:, hoːɭiː]) is a major Hindu festival celebrated as the Festival of Colours, Love and Spring. It celebrates the eternal and divine love of the deities Radha and Krishna. Additionally, the day signifies the triumph of good over evil, as it commemorates the victory of Vishnu as Narasimha over Hiranyakashipu. Holi originated and is predominantly celebrated in the Indian subcontinent, but has also spread to other regions of Asia and parts of the Western world through the Indian diaspora.

Holi also celebrates the arrival of spring in India, the end of winter, and the blossoming of love. It is also an invocation for a good spring harvest season. It lasts for a night and a day, starting on the evening of the Purnima (full moon day) falling on the Hindu calendar month of Phalguna, which falls around the middle of March in the Gregorian calendar.

Holi (Hindi: होली, Gujarati: હોળી, Kannada: ಹೋಳಿ, Marathi: होळी, Nepali: होली, Punjabi: ਹੋਲੀ, Telugu: హోళి, Odia: ହୋଲି) is also known as Dol Jatra ("swing festival") and Bôshonto Utshôb (Bengali: বসন্ত উৎসব) ("spring festival") in Bengal (West Bengal and Bangladesh), Phakua (Assamese: ফাকুৱা) and Dôl Jātrā (Assamese: দ’ল যাত্ৰা) in Assam, Phāgu Pūrṇimā (Nepali: फागु पूर्णिमा) in the hilly region of Nepal, Dola jātra (Odia: ଦୋଳଯାତ୍ରା) in Odisha, Fagua or Phagua (Bhojpuri: 𑂤𑂏𑂳𑂄) in eastern Uttar Pradesh, western Bihar, and northwestern Jharkhand and Fiji, Phagwah or Phagwa in the Caribbean (namely Trinidad and Tobago, Guyana, Suriname, and Jamaica).

The main day of the celebration is known as "Holi", "Rangwali Holi", "Dola Purnima", "Dhuleti", "Dhulandi", "Ukuli", "Manjal Kuli", "Yaosang", "Shigmo", "Phagwah", or "Jajiri".

Holi is a sacred ancient tradition of Hindus, a holiday in many states of India with regional holidays in other countries. It is a cultural celebration that gives Hindus and non-Hindus alike an opportunity to have fun and play with other people by throwing coloured water and powder at each other. It is also observed broadly on the Indian subcontinent. Holi is celebrated at the end of winter, on the last full moon day of the Hindu luni-solar calendar month, marking the spring, making the date vary with the lunar cycle. The date falls typically in March, but sometimes in late February of the Gregorian calendar.

The festival has many purposes; most prominently, it celebrates the beginning of spring. In 17th century literature, it was identified as a festival that celebrated agriculture, commemorated good spring harvests, and the fertile land. Hindus believe it is a time to enjoying spring's abundant colours and say farewell to winter. To many Hindus, Holi festivities mark an occasion to reset and renew ruptured relationships, end conflicts, and rid themselves of accumulated emotional impurities from the past.

It also has a religious purpose, symbolically signified by the legend of Holika. The night before Holi, bonfires are lit in a ceremony known as Holika Dahan (burning of Holika) or Little Holi. People gather near fires, sing and dance. The next day, Holi, also known as Dhuli in Sanskrit, or Dhulheti, Dhulandi or Dhulendi, is celebrated.

In northern parts of India, children spray coloured powder solutions (gulal) at each other, laugh, and celebrate, while adults smear dry coloured powder (abir) on each other's faces. Visitors to homes are first teased with colours, then served with Holi delicacies (such as gujhia, shakkarpaare, matri, and dahi vada), desserts and drinks. After playing with colours, and cleaning up, people bathe, put on clean clothes, and visit friends and family.