Andrea Horwath (/ˈhɔːrvæθ/; born October 24, 1962) is a Canadian politician who has been the 58th mayor of Hamilton since 2022. Horwath previously served as the member of Provincial Parliament (MPP) for Hamilton Centre from 2004 to 2022, as leader of the Ontario New Democratic Party (NDP) from 2009 to 2022 and as the leader of the Official Opposition in Ontario from 2018 to 2022. During the 2018 provincial election, Horwath led the Ontario NDP to official opposition status after 23 years without government or official opposition status.