Buddha's Birthday or Buddha Day is a primarily Buddhist festival that is celebrated in most of South, Southeast and East Asia, commemorating the birth of the prince Siddhartha Gautama, who became the Gautama Buddha and founded Buddhism. According to Buddhist tradition and archaeologists, Gautama Buddha, c. 563-483 BCE, was born at Lumbini in Nepal. Buddha's mother was Queen Maya Devi, who delivered the Buddha while undertaking a journey to her native home, and his father was King Śuddhodana. The Mayadevi Temple, its gardens, and an Ashoka Pillar dating from 249 BCE mark the Buddha's birth place at Lumbini.

The following table indicates declared Indonesian government national holidays. Cultural variants also provide opportunity for holidays tied to local events. Beside official holidays, there are the so-called "libur bersama" or "cuti bersama", or joint leave(s) declared nationwide by the government. In total there are 16 public holidays every year.