Middlesbrough Council is a unitary authority in North Yorkshire, England. Until 1 April 1996 it was a non-metropolitan district in Cleveland. Since 2002 it has also had a directly elected mayor.
The by-election was caused by the resignation of Councillor Ansab Shan, a member of the Labour Party, to accept an appointment with the Crown Prosecution Service
The by-election was caused by the resignation of Councillor John Cole, Labour's chair of Middlesbrough Council's planning committee. He did not give a reason. In 2012 his car had been subject to an arson attack, which also involved another councillor's car.
The by-election was caused by the death of Councillor Bernie Taylor.
The by-election was caused by the death of Councillor Peter Cox.
The by-election was caused by the death of Councillor Peter Purvis.
The by-election was caused by the resignation of Councillor Jan Mohan, citing health reasons.
The by-election was caused by the resignation of Councillor David Smith.
The by-election was caused by the death of Councillor June Goodchild.
The by-election was caused by the resignation of Councillor Ashley Waters.
The by-election was caused by the resignation of Councillor Lee Garvey.
The by-election was caused by the resignation of Councillor Antony High.
The by-election was caused by the resignation of Councillor Sheila Dean.
The by-election was caused by the resignation of Councillor Matt Storey.
The by-election was caused by the resignation of Councillor Morgan McClintock.