Legislative elections were held in Argentina on 14 November 2021. Half of the seats in the Chamber of Deputies and a third of the seats in the Senate were renewed. The election had previously been scheduled to take place on 24 October 2021, but was postponed due to the COVID-19 pandemic in Argentina.

The Chamber of Deputies, officially the Honorable Chamber of Deputies of the Argentine Nation, is the lower house of the Argentine National Congress. It is made up of 257 national deputies who are elected in multi-member constituencies corresponding with the territories of the 23 provinces of Argentina by party list proportional representation. Elections to the Chamber are held every two years, so that half of its members are up in each election, making it a rare example of staggered elections used in a lower house.