Buddhism in Vietnam (Vietnamese: Đạo Phật, 道佛 or Phật Giáo, 佛教), as practiced by the Vietnamese people, is a form of East Asian Mahayana Buddhism. It is the second religion in Vietnam. According to the Vietnamese government's 2019 National Population and Housing Census, approximately 4.6 million individuals identified as Buddhists, representing about 4.8% of the total population at that time. Roman Catholics represent 6.1% of the total population and the vast majority (83.6%) stated that they had to no religion or practice folk religion. However, the U.S. Department of State's 2023 Report on International Religious Freedom cites Vietnam's "White Book" that the Buddhist population increased from nearly 10 million in 2008 to approximately 14 million in 2021, which accounts for 13.3% of the overall population of Vietnam.
Buddhism may have first come to Vietnam as early as the 3rd or 2nd century BCE from the Indian subcontinent or from China in the 1st or 2nd century CE. Vietnamese Buddhism has had a syncretic relationship with certain elements of Taoism, Chinese spirituality, and Vietnamese folk religion. Theravada Buddhism also exists, as well as indigenous forms of Vietnamese Buddhism such as Bửu Sơn Kỳ Hương and Hòa Hảo.