Westminster City Council, the local authority of the City of Westminster in London, England, is elected every four years. Since the last boundary changes in 2022 the council has comprised 54 councillors representing 18 wards, with each ward electing three councillors. Elections are held every four years.

Results summary

From the first elections to the council in 1964 until 2022, overall political control of the council was held by the Conservatives, with Labour gaining control in 2022:

Council elections

Borough result maps

By-election results

1964–1968

1968–1971

1971–1974

1974–1978

There were no by-elections.

1971–1982

There were no by-elections.

1982–1986

The by-election was called following the resignation of Michael B. Forsyth. The by-election was called following the resignation of Francis Maude. The by-election was called following the death of Jean Merriton.

1986–1990

The by-election was called following the resignation of Peter J. Hartley. The by-election was called following the resignation of Rachel E. Whittaker. The by-election was called following the resignation of Patricia M. Kirwan.

1990–1994

The by-election was called following the resignation of Barry C. Legg. The by-election was called following the resignation of Shirley Porter. The by-election was called following the resignation of Joseph Glickman. The by-election was called following the death of Hugh G. Garside.

1994–1998

The by-election was called following the resignation of Peter C. S. Bradley. The by-election was called following the resignation of Karen P. Buck. The by-election was called following the resignation of Andrew H. Dismore.

1998–2002

The by-election was called following the resignation of Nicola Russell. The by-election was called following the resignation of Richard A. Stirling-Gibb. The by-election was called following the resignation of Ron M. Harley. The by-election was called following the resignations of Jillian A. Selbourne and Gary P. Martin. The by-election was called following the resignation of Jonathan S. Djanogly.

2002–2006

The by-election was called following the resignation of Josephine S. Ohene-Djan.

2006–2010

The by-election was called following the death of Kevin A. Gardner. The by-election was called following the resignation of Michael G. Vearncombe. The by-election was called following the death of Antony G. Mothersdale. The by-election was called following the resignation of Simon H. Milton. The by-election was called following the death of Ian G. Wilder. The by-election was called following the death of Mushtaq A. Qureshi.

2010–2014

The by-election was called following the resignation of Colin Barrow. The by-election was called following the resignation of Harvey C. J. Marshall.

2014–2018

The by-election was called following the resignation of Edward J. C. Argar. The by-election was called following the resignation of Nilavra Mukerji. The by-election was called following the death of Audrey R. Lewis. The by-election was called following the resignation of Vincenzo Rampulla.

2018–2022

The by-election was called following the resignation of Robert J. Davis. The by-election was called following the resignation of Andrea Mann.

2022-2026

The by-election was caused by the resignation of Amanda Langford.