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. She was a candidate for governor of Maryland in the 2014 election but lost the Democratic primary to lieutenant governor Anthony G. Brown. In 2021, she announced her intention to run for Maryland's 1st congressional district in the 2022 election against incumbent Republican congressman Andy Harris.