Oregon's 1st Senate district

It is composed of Oregon House districts 1 and 2.

It is currently represented by Republican David Brock Smith of Port Orford, who was appointed to the seat on January 11, 2023 after the resignation of Dallas Heard.

District boundaries have changed over time.

From 1993 until 2003, the district covered part of Northwest Oregon; from 2003 through 2013, it covered a similar region as today plus northern parts of Jackson and Josephine counties; and from 2013 through 2023, it covered the same areas as previously mentioned while adding more territory in western Josephine county.

The current district adds more of eastern Douglas County compared to the previous iteration while losing southern Douglas County as well as all parts of Jackson and Josephine counties previously included in the district.