The 2012 Hawaii Senate Elections were held on November 6, 2012. State senators in all 25 districts of the Hawaii Senate were up for election. 9 seats were won in the primary uncontested. No seats changed parties in this election.
No seats were lost as a result of the decennial reappropriation of districts. Only 2 incumbent senators were not reelected. District 11 Senator Carol Fukunaga was defeated by fellow Democratic Senator Brian Taniguchi (formerly District 10) in the primary. Pohai Ryan, incumbent District 25 senator, was defeated by Laura Thielen in the primary.