Alaska Senate district O is one of 20 districts of the Alaska Senate. It has been represented by Republican George Rauscher since November of 2025 after filling the vacancy left by Mike Shower, who resigned to run for lieutenant governor in the 2026 gubernatorial election. District O is located in the Mat-Su Valley and encompasses the entirety of Alaska's 29th House of Representatives district and 30th House of Representatives district, including Valdez, Houston, and Big Lake.[2]
From 2013 to 2022, the district covered a portion of Alaska south of Anchorage - this area is now encompassed by district D.