The 2012 Puerto Rico Senate election was held on November 6, 2012, to elect the members of the Senate of Puerto Rico for the next four years, from January 2, 2013 until January 1, 2017.
The governing party (the PNP) presented 22 candidates to the Senate, 18 of them incumbents. The main opposing party (the PPD) presented 22 candidates as well, 5 of them incumbents. There were also 36 other candidates from the other minority parties, and one independent candidate.
After the election, the PNP had lost the majority of its seats, winning only 8 seats. The PPD won the majority of seats with 18. One candidate from the Puerto Rican Independence Party also won a minority seat.
After the previous election, the New Progressive Party augmented their majority within the Senate of Puerto Rico with 22 seats versus only 5 seats from the Popular Democratic Party. By virtue of the Minority Law of the Constitution of Puerto Rico, four more senators from the PPD were added to complete a full minority. Also, for the first time in 27 years, the Puerto Rican Independence Party was left without a senator.
During the four years after the 2008 elections, the Senate of Puerto Rico was affected by scandals of corruption and ethics that resulted in the resignation of three members from the PNP delegation (Roberto Arango, Héctor Martínez, Antonio Soto Díaz). Also, one of the members of the PPD delegation (Eder Ortíz Ortíz) resigned to become Electoral Commissioner of the party. All four seats were filled before the elections.