The 2012 elections for the Oregon Legislative Assembly determined the composition of both houses for the 77th Oregon Legislative Assembly. The Republican and Democratic primary elections were on May 15, 2012, and the general election was on November 6, 2012. Sixteen of the Oregon State Senate's 30 seats were up for election, as were all 60 seats of the Oregon House of Representatives. In the Senate, the Democrats kept a 16–14 majority, identical to their advantage in the previous legislative session. In the House, Democrats took a 34–26 majority, up from a 30–30 split in the previous session.