Heather R. Mizeur (/mɪˈzɪər/ mi-ZEER; born December 6, 1972) is an American politician and member of the Democratic Party from the state of Maryland. She has 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 of Maryland Anthony G. Brown.