2014 Washington State Senate election

The 2014 Washington State Senate elections is one of the biennial legislative elections in Washington that took place on November 4, 2014. In this election, about half of the 49 legislative districts in Washington chose a state senator for a four-year term to the Washington State Senate. 24 seats were regularly scheduled to be up this cycle, along with 1 additional seat holding a special election to fill an unexpired term: the 28th district, held by appointed Senator Steve O'Ban, whose former incumbent Mike Carrell vacated the seat. Republicans had flipped another seat in a 2013 special election, giving them 24 seats heading into the 2014 elections, with two Democrats caucusing with them to provide them a majority.

A top two primary election on August 5, 2014, determined which candidates appear on the November ballot. Candidates were allowed to declare a party preference.

Republicans won the 30th district after Mark Miloscia switched parties and won re-election as a Republican. Democrats flipped the 48th district from a Democrat who caucused with the Republicans, Rodney Tom. While this kept the state senate at 26-23 in favor of the Majority Coalition Caucus, only one Democrat remained in the coalition.