Pa'chum Bun (Khmer: ភ្ជុំបិណ្ឌ, Phchŭm Bĕnd [pʰcom bən], lit. "Ancestor's Day") is a Cambodian 15-day religious festival, culminating in celebrations on the 15th day of the tenth month in the Khmer calendar, at the end of the Buddhist Lent, Vassa. In 2022, Pa'chum Bun began on September 11 and ended on September 25.