Joanne McCartney is a British barrister and Labour Party and Co-operative Party politician. Since 2004, she 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 has served as Statutory Deputy Mayor of London.

Prior to her career in politics, Joanne McCartney worked as a barrister specialising in employment law. She also worked as an adjudicator for the Housing Ombudsman dealing with disputes between landlords and tenants.^[1][2]

McCartney was elected councillor in the London Borough of Enfield in 1998, representing Edmonton and then Palmers Green.^{[citation needed]}

She was elected to the London Assembly for Enfield and Haringey in the 2004 Assembly Elections and stood down as a councillor at the 2006 local elections.^[3]

She was a member of the Metropolitan Police Authority As Deputy Mayor, McCartney has led work on the Mayor of London's universal free school meals programme ^[4] and on the Young Londoners fund and worked to create "Early Years Hubs" for disadvantaged children.^[5] As an Assembly Member, she has campaigned on rail devolution^[6] upgrades to the Piccadilly Line ^[7] and child poverty.^[8]

McCartney won re-election in 2008 by approximately 1,400 votes. In the 2012 election, she increased her margins to 36,741 votes. In the 2016 election, she broke records by winning by a margin of 51,152 votes.^[9]

Since the election of Sadiq Khan as [[Mayor of London] in 2016, McCartney has served as Statutory Deputy Mayor of London.^[10]

McCartney has three children, and was chair of governors at her local primary school.^[11]