Heather R. Mizeur is an American politician who served as a member of the Maryland House of Delegates from January 10, 2007 to January 14, 2015, representing the 20th district in Montgomery County, Maryland. She was a candidate for governor of Maryland in the 2014 election but lost the Democratic primary to Lieutenant Governor Anthony Brown. In 2022, she unsuccessfully ran for the United States House of Representatives in Maryland's 1st congressional district, challenging incumbent U.S. Representative Andy Harris. She lost the general election to Harris by 11 points.

The 2014 Maryland gubernatorial election took place on November 4, 2014, to elect the governor and lieutenant governor of Maryland. Incumbent Democratic governor Martin O'Malley was term-limited and could not run for re-election to a third consecutive term.