Oregon's 30th Senate district

District 30 of the Oregon State Senate comprises all of Baker, Crook, Grant, Harney, Lake, and Malheur counties, as well as parts of Deschutes and Jefferson counties.

It is currently represented by Republican Mike McLane of Powell Butte.

District boundaries have changed over time.

From 1993 until 2003, it covered a slightly different area in eastern Oregon; from 2003 until 2013, it extended to cover Gilliam, Jefferson, Sherman, Wasco, and Wheeler counties and parts of Deschutes and Lake counties; and from 2013 until 2023, it lost all of these gains except western Wasco County, northern Deschutes County, and Jefferson County.

The current district is more compact and adds all of Crook and Lake counties, which have historically been a part of other districts, while losing parts of northern Jefferson County and northern Deschutes County as well as all of Wasco and Wheeler counties.