Jonathan Bartlett Jennings is an American politician and farmer who has served as a member of the Maryland Senate representing the seventh district since 2011. A member of the Republican Party, he previously represented the district in the Maryland House of Delegates from 2003 to 2011, and served as the minority leader of the Senate from 2014 to 2020.

The Maryland Senate, sometimes referred to as the Maryland State Senate, is the upper house of the General Assembly, the state legislature of the U.S. state of Maryland. Composed of 47 senators elected from an equal number of constituent single-member districts, the Senate is responsible, along with the Maryland House of Delegates, for passage of laws in Maryland, and for confirming executive appointments made by the Governor of Maryland.