Lord Buddha's Parinirvana is a public holiday in Bhutan that is held on the 15th day of the fourth month of the Bhutanese calendar, usually falling in June of the Gregorian calendar. This holiday, also known as Buddha Shakyamuni’s Parinirvana, marks the death anniversary of Gautama Buddha, the founder of Buddhism. The sacred day is dedicated to the spiritual leader who has had an enormous influence, not just in Bhutan, but throughout the world. Buddhist scriptures say that it was on this day that Buddha, after delivering his final sermon, passed away or attained Parinirvana.

The day is celebrated in Bhutan with great reverence and solemnity, indicating the nation’s deep-rooted Buddhist traditions and practices. Bhutanese people commemorate this day by visiting local monasteries, offering prayers, and making donations or offerings called 'Dana'. These practices are believed to earn merit and help in personal spiritual development. Ritualistic prayers, sermons, and illuminations are a common sight at monasteries, symbolizing enlightenment. Various cultural and religious events are organized on this day, including recitation of Buddhist scriptures, discourses by monks, and meditation sessions.

The Parinirvana of Buddha is an occasion for the citizens of Bhutan to reaffirm their faith, reflect upon their actions, and engage in beneficial deeds. It is seen as a day for Bhutanese people to aspire for strong moral values, compassion, mindfulness, and wisdom, following the teachings of Buddha. This deep reverence and observance of the day clearly show how Buddhism, as a religion and philosophy, is intimately woven into Bhutan's cultural, social, and personal life. Ultimately, Lord Buddha's Parinirvana serves as a reminder of the impermanence of life and the importance of spiritual liberation.