The 2013 election to the Senate of the Philippines was the 31st election to the Senate of the Philippines. It was held on Monday, May 13, 2013 to elect 12 of the 24 seats in the Senate. Together with those elected in 2010, the candidates elected in this election shall comprise the 16th Congress. The senators elected in 2010 will serve until June 30, 2016, while the senators elected in this election will serve up to June 30, 2019. The elections to the House of Representatives as well as local elections occurred on the same date. The Philippines use plurality-at-large voting for seats in the Senate: the twelve candidates with the highest number of votes win the twelve seats up for election. The Senate seat vacated by President Benigno Aquino III in 2010 was among the twelve seats to be put f