The Independent Party of Oregon (IPO) is a centrist political party in the U.S. state of Oregon with more than 135,000 registrants since its inception in January 2007. The IPO is Oregon's third-largest political party and the first political party other than the Democratic Party and Republican Party to be recognized by the state of Oregon as a major political party. Since 2009, the party has had multiple city and local officials elected as members. In 2021 State Senator Brian Boquist, a former Republican, became the only Independent member of the state legislature.