Ruth Johnson is an American businesswoman and politician currently serving as a member of the Michigan Senate since 2019. She was the 42nd Secretary of State of Michigan from 2011 to 2019 and a member of the Michigan House of Representatives from 1999 to 2005. She is a Republican.

The Michigan Department of State is administered by the Secretary of State, who is elected on a partisan ballot for a term of four years in gubernatorial elections. The incumbent secretary of state is Jocelyn Benson, a Democrat elected in 2018 and 2022.