Weymouth and Portland Borough Council in Dorset, England existed from 1974 to 2019. One-third of the council was elected each year, followed by one year where there was an election to Dorset County Council instead. The council was abolished and subsumed into Dorset Council in 2019.

Political control

The first elections to the council were held in 1973, initially operating as a shadow authority prior to the district coming into effect the following year. From 1973 until its abolition in 2019 political control of the council was held by the following parties:

Leadership

The role of mayor was largely ceremonial at Weymouth and Portland Borough Council. Political leadership was instead provided by the chair of the management committee, sometimes referred to as the leader of the council. The leaders from 2002 until the council's abolition in 2019 were:

Party representation

Council elections

Borough result maps

By-elections

1998-2002

2002-2006

2006-2010

A by-election was held in Wyke Regis ward on 10 December 2009 following the death of councillor Doug Hollings (Conservative).

2010-2014

A by-election was held in Melbombe Regis ward on 16 May 2013 following the death of councillor Peter Farrell (Conservative) in April 2013. Farrell had been elected in May 2012 and so the election was for the period May 2013 to May 2016.

2014-2019

A by-election was held in Wey Valley ward on 20 October 2016 following the resignation of Cory Russell (Conservative). A by-election was held in Westham East ward on 4 May 2017 following the resignation of councillor Sally Maslin (Liberal Democrats). A by-election was held in Tophill East ward on 8 February 2018 following the resignation of councillor David Hawkins (Independent). A by-election was held in Tophill West ward on 8 February 2018 following the resignation of councillor Jason Webb (Conservative). Green councillor Claudia Moore (Weymouth West, elected as a Conservative) resigned from the council on 20 December 2017. The vacancy was originally going to be left to be filled in the scheduled on-third election on 3 May 2018. However, following the government's approval of the Dorset mergers with first elections 2 May 2019, the election was cancelled and the by-election for Weymouth West was called for 3 May 2018.