James Ignatius O'Rourke McMahon, OBE, FRSA (born 7 July 1980) is MP for Oldham West and Royton, having won the seat at a by-election in December 2015. He has been a councillor since 2003 and served as leader of Oldham Metropolitan Borough Council.
McMahon was first elected to Oldham Metropolitan Borough Council in November 2003 as a Labour councillor for Failsworth East ward. He held various posts on Oldham Council before becoming the council's Labour group leader in 2008 after the Liberal Democrats won control of the authority. At the 2011 local elections, Labour re-gained control of the council and McMahon became its leader. As council leader McMahon sat as one of the 11 members of the Greater Manchester Combined Authority with responsibility for transport.
McMahon was the inaugural chairman of the Co-operative Council Innovation Network and served as the Labour leader of the Local Government Association. McMahon was named the 6th most influential person in local government by The Local Government Chronicle ahead of senior government ministers.
In August 2014, McMahon was elected to represent Labour councillors on the party's National Executive Committee (NEC).
In 2016, McMahon stood down as council leader and was replaced by his Deputy, Jean Stretton
McMahon won the selection to be Labour Party candidate at the Oldham West and Royton by-election following the death of incumbent Michael Meacher.
At the by-election held on 3 December 2015, McMahon was elected Member of Parliament for Oldham West and Royton, with 62% of the vote – an increase of seven percentage points since the 2015 general election. ]]< He served as Parliamentary Private Secretary to the Deputy Leader of the Labour Party until being appointed to serve as Shadow Minister for Local Government and Devolution.