The São Bento Palace in Lisbon is the seat of the Assembly of the Portuguese Republic, the parliament of Portugal. Originally constructed in 1598, São Bento has served as the seat of Portugal's parliament since 1834, when the former monastery of the Benedictine Order was dissolved after the Liberal Wars. During the Portuguese constitutional monarchy, the palace served as the seat of the Cortes Gerais, the traditional parliaments of Portugal, until 1910.

The Assembly of the Republic, commonly referred to as simply Parliament, is the unicameral parliament of Portugal. According to the Constitution of Portugal, the parliament "is the representative assembly of all Portuguese citizens". The constitution names the assembly as one of the country's organs of supreme authority.