The Buddhist crisis was a period of political and religious tension in South Vietnam between May and November 1963, characterized by a series of repressive acts by the South Vietnamese government and a campaign of civil resistance, led mainly by Buddhist monks.

The crisis was precipitated by the Xá Lợi Pagoda raids and the Huế Phật Đản shootings, where army and police fired guns and launched grenades into a crowd of Buddhists who had been protesting against a government ban on flying the Buddhist flag on the day of Phật Đản, which commemorates the birth of Gautama Buddha. Diệm denied governmental responsibility for the incident and blamed the Việt Cộng, which added to discontent among the Buddhist majority.