Reading West and Mid Berkshire is a constituency in the House of Commons of the UK Parliament. It was formed as a result of the 2023 Periodic Review of Westminster constituencies and primarily replaced the former Reading West constituency, also subsuming parts for the Newbury and Wokingham constituencies. It was first contested at the 2024 general election. Since 2024 it has been represented by Olivia Bailey of the Labour Party.

Some 30% of the constituency's voters live in the Borough of Reading, with the remainder living in the West Berkshire local government area.

At the time of the 2023 Periodic Review of Westminster constituencies, there were eight constituencies in the county of Berkshire. Of these constituencies, only three (Reading East, Reading West, and Windsor) were within the permitted electorate range of no fewer than 69,724 electors and no more than 77,062. All of the remaining constituencies were above the upper limit. The Boundary Commission for England therefore proposed the addition of a ninth constituency within the county.

Whilst both Reading constituencies could have remained unchanged, the boundary commission instead proposed a reconfiguration to account for the increased electorates of the surrounding constituencies, and to better reflect local ties in the surrounding communities. This involved the creation of two new constituencies (Earley and Woodley and Mid Berkshire), both with the bulk of their electorate outside the Borough of Reading but including outer wards of the borough, together with a new Reading Central constituency entirely within the borough.

During the process of acceptance of these proposals, the name was changed from Mid Berkshire to West Reading and Mid Berkshire, despite the relative small proportion of the constituency that is within Reading. The new constituency includes three borough wards and twelve wards from West Berkshire, as opposed to seven and six respectively for the old Reading West constituency.

In mid-October 2023, the Liberal Democrats selected Helen Belcher OBE as their prospective parliamentary candidate for the seat in the 2024 general election. At the beginning of January 2024, two West Berkshire councillors joined the candidate list, with Carolyne Culver announced as the Green Party candidate and Adrian Abbs announcing his intention to run as an independent candidate. In February 2024, Olivia Bailey was announced as the Labour Party candidate and in April Ross Mackinnon was announced as the Conservative Party candidate.

In December 2023, the national Labour party included the constituency in its list of 211 non-battleground seats, suggesting they did not see it as winnable. In 23 March 2024, when announcing Bailey's candidature, the local party did describe the constituency as a 'battleground' seat.

The constituency has a mixed nature, including parts of the continuously built-up urban area of Reading (both within and without the boundaries of the borough) and an extensive rural area, which includes villages such as Aldermaston, Aldworth, Bradfield, Basildon, Bucklebury, Burghfield, Compton, East Ilsley, Hampstead Norreys, Mortimer, Pangbourne, Streatley, Theale, West Ilsley, Woolhampton and Yattendon. Some 30% of the constituency's voters live in the Borough of Reading, with the remainder living in the West Berkshire local government area.

The wards that make up the constituency are represented by 26 councillors. As of November 2023, these comprise 11 Liberal Democrats, 8 Conservatives, 6 Labour and 1 Green.

The constituency is composed of the following wards (as they existed on 1 December 2020):

• The Borough of Reading wards of: Kentwood, Norcot, and Tilehurst; and
• The District of West Berkshire wards of: Aldermaston, Basildon, Bradfield, Bucklebury, Burghfield & Mortimer, Downlands (polling district BC), Pangbourne, Ridgeway, Theale, Tilehurst & Purley, Tilehurst Birch Copse, and Tilehurst South & Holybrook.

The Reading wards, together with Pangbourne, Theale and the three Tilehurst wards in West Berkshire, comprising 67% of the electorate, were previously in the Reading West seat, with the remaining areas coming from Newbury and Wokingham in equal parts.

The seat is bordered by Newbury, Didcot and Wantage, Henley and Thame, Reading Central, Earley and Woodley, Wokingham, North East Hampshire, and North West Hampshire.

Reading West prior to 2024

Election		Member	Party
	2024	Olivia Bailey	Labour

General election 2024: Reading West and Mid Berkshire

Party		Candidate	Votes	%	±%
	Labour	Olivia Bailey	16,273	35.0	+12.1
	Conservative	Ross Mackinnon	14,912	32.0	–24.8
	Reform UK	Kate Bosley	6,260	13.4	N/A
	Liberal Democrats	Helen Belcher	5,103	10.9	–5.9
	Green	Carolyne Culver	3,169	6.8	+3.4
	Independent	Adrian Abbs	562	1.2	N/A
	Independent	Adie Peppiatt	272	0.6	N/A
Majority			1,361	3.0	N/A
Turnout			46,551	67.7	–2.9
Registered electors			68,786
	Labour gain from Conservative		Swing	18.5

2019 notional result
Party		Vote	%
	Conservative	28,078	56.8
	Labour	11,320	22.9
	Liberal Democrats	8,356	16.9
	Green	1,690	3.4
Turnout		49,444	70.6
Electorate		69,999

• List of parliamentary constituencies in Berkshire
• List of parliamentary constituencies in the South East England (region)

• Reading West and Mid Berkshire UK Parliament constituency (boundaries from June 2024) at MapIt UK

51°27′N 1°08′W / 51.45°N 1.14°W / 51.45; -1.14