District 9 of the Virginia Senate is a senatorial district that currently encompasses all of Charles City County and portions of the City of Richmond, Henrico County and Hanover County in the U.S. state of Virginia. The current Senator from District 9 is Donald McEachin. The district changed significantly during the redistricting after the 1950 and 1960 censuses, and for a time represented Arlington County in Northern Virginia (not even contiguous to the current boundaries). Earlier, the district represented Prince Edward County, Virginia to the south and west of the current boundaries.
From 1940 to 1956, the 9th Senate District included the Virginia Piedmont counties of Amelia, Amherst, Appomattox, Buckingham, Cumberland, Nelson and Powhatan.
From 1956 to 1966, the 9th Senate District included all of Arlington County. As a result of the U.S. Supreme Court's ruling in the One person, one vote case of Davis v. Mann, the General Assembly redistricted itself and from 1966 to 1970, Arlington County was divided into 2 districts with the 9th District including only the southern portion of the county.