1861 Riograndense legislative election (RRG)

The 1861 Riograndense legislative elections occurred in the middle of Manuel Lucas de Oliveira's first term. Following the 1860 census, the size of the General Assembly increased to 60 members as the Chamber grew to 40 seats and the Senate's size expanded to twenty seats. Additionally, the number of Senate classes was reduced from three to two following a constitutional amendment, which resulted in the election of 15 senators in the 1861 election. Ten of these senators belonged to the second class for the 1861-18 and five were elected as members of the first class for a shortened 1861-1865 term.

The election resulted in another landslide victory for the Radical Party as it retained its supermajority in the enlarged houses of the General Assembly with a substantially increased share of the popular vote. As the conservative political elite shifted its support towards the ruling Radicals, the opposition Party of Order lost weight in both houses and began its decline.