Middlesbrough and Thornaby East is a constituency of the House of Commons in the UK Parliament. Further to the completion of the 2023 Periodic Review of Westminster constituencies, it was first contested in the 2024 general election and is currently held by Andy McDonald of the Labour Party, who previously held the abolished constituency of Middlesbrough from 2012 to 2024.

The composition of the constituency is as follows (as they existed on 1 December 2020):

• The Borough of Middlesbrough wards of: Acklam; Ayresome; Berwick Hills & Pallister; Brambles & Thorntree; Central; Kader; Linthorpe; Longlands & Beechwood; Newport; North Ormesby; Park; Trimdon.
• The Borough of Stockton-on-Tees wards of: Mandale and Victoria; Stainsby Hill.

The seat is the successor to the Middlesbrough constituency, subject to alignment of the boundaries to take account of a revised local authority ward structure. In order for the electorate to be within the permitted range, the two Stockton-on-Tees wards, comprising the eastern part of the town of Thornaby-on-Tees, were transferred from Stockton South (abolished).

Middlesbrough prior to 2024

Election		Member	Party
	2024	Andy McDonald	Labour

General election 2024: Middlesbrough and Thornaby East

Party		Candidate	Votes	%	±%
	Labour	Andy McDonald	16,238	47.2	−6.8
	Reform UK	Patrick Seargeant	7,046	20.5	+14.3
	Conservative	Kiran Fothergill	6,174	17.9	−6.4
	Workers Party	Mehmoona Ameen	2,007	5.8	N/A
	Green	Matthew Harris	1,522	4.4	+2.9
	Liberal Democrats	Mo Waqas	1,037	3.0	+0.4
	Independent	Mark Baxtrem	383	1.1	N/A
Majority			9,192	26.7
Turnout			34,407	45.8
	Labour hold		Swing

• List of parliamentary constituencies in North East England (region)

• Middlesbrough and Thornaby East UK Parliament constituency (boundaries from June 2024) at MapIt UK

54°34′N 1°15′W / 54.56°N 1.25°W / 54.56; -1.25