The Plaza Miranda bombing occurred during a political rally of the Liberal Party at Plaza Miranda, Quiapo district, Manila, the Philippines on August 21, 1971. It caused nine deaths and injured 95 others, including many prominent Liberal Party politicians.

Quiapo is a district of the city of Manila, in the National Capital Region of the Philippines. Referred to as the “Old Downtown of Manila", the district’s most famous landmark is Quiapo Church, a minor basilica enshrining the Black Nazarene image processed every January by millions of devotees. Quiapo is also known as a place for bargain hunting.