Alaska Senate district O is one of 20 districts of the Alaska Senate. It has been represented by Republican Mike Shower since 2023. Shower previously represented District E from 2018−2023. 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.