Joanne McCartney is a British lawyer and a co-operative Party politician. He is a member of the Labour Party. Since 2004, he has served as a member of the London Assembly, representing Enfield & Haringey. Following the election of Sadiq Khan as Mayor of London in 2016, McCartney became Statutory Deputy Mayor of London.
McCartney was elected as a councilor in the London Borough of Enfield in 1998, representing Edmonton and then Palmers Green. McCartney was elected to the London Assembly for Enfield and Haringey in the 2004 Assembly Elections and became a councilor in 2006 local elections.
McCartney won re-election in the 2008 by about 1,400 votes. In the 2012 election, he increased his margin to 36,741 votes. In the 2016 election, he broke records by winning by a margin of 51,152 votes. McCartney has three children and is chair of governors at his local primary school.