Wantage was a constituency^{[n 1]} in Oxfordshire represented in the House of Commons of the Parliament of the United Kingdom.^{[n 2]}

Its final MP was the Conservative David Johnston, who was first elected at the 2019 general election replacing Ed Vaizey who served as MP for Wantage for 14 years after first being elected at the 2005 general election.^[1]

Further to the completion of the 2023 Periodic Review of Westminster constituencies, the seat was abolished. Subject to a reduction in size, with northern and western areas, including the town of Faringdon, being transferred to Witney, it was reformed as Didcot and Wantage, to be first contested at the 2024 general election.^[2]

The Wantage constituency covered the south-western part of Oxfordshire. There were three market towns in the constituency: Faringdon, Wallingford and Wantage. All have tourist attractions, Wantage having monuments to being the birthplace of King Alfred the Great, Wallingford, ancient enclosure walls of a castle and a medieval bridge.^{[n 3]} Faringdon bears a scar of the English Civil War as its church lost its steeple. The largest town in the constituency was Didcot, which grew up around the Great Western Railway when Isambard Kingdom Brunel built a branch line from its main line between London and Bristol to Oxford, siting the junction at the then-sparsely-populated parish and it has a power station and many major national construction and aggregate industries.

The constituency was mostly rural in character, with more than 400 farms in operation. Included were the Uffington White Horse and The Ridgeway, a prehistoric road, runs along its southern border. The River Thames runs along the northern and western border. The area is affluent and Conservative in nature containing many commuters with fast transport links to London, with Didcot the only area with a strong Labour vote locally. The seat includes international race horse breeders and trainers with racing stables across a broad area that reaches into the Lambourn Downs, crossing over the southern border into the Newbury constituency in Berkshire.

Workless claimants, registered jobseekers, were in November 2012 significantly lower than the national average of 3.8%, at 1.6% of the population based on a statistical compilation by The Guardian.

The constituency was created for the 1983 general election further to the Third Periodic Review of Westminster constituencies. This followed on from the reorganisation of local government under the Local Government Act 1972 which came into force in April 1974, and saw the bulk of the area represented by the constituency of Abingdon in Berkshire being transferred to Oxfordshire. Under the Review, the majority of the Abingdon constituency formed the new constituency of Wantage, with the town of Abingdon-on-Thames and areas to the west of Oxford being included in the new constituency of Oxford West and Abingdon.

The first MP for Wantage was Robert Jackson, who served as a junior minister under both Margaret Thatcher and John Major. Jackson defected to the Labour Party in 2005 shortly before standing down as an MP for the 2005 general election. At that election, Ed Vaizey was elected as MP for Wantage and 2010-2016 held the post of Minister for Culture, Communications and Creative Industries.

Ed Vaizey served as MP for Wantage until the 2019 general election whereby Vaizey announced that he would be standing down. Shortly prior to this, Vaizey had the Conservative whip removed after voting against Prime Minister Boris Johnson on 3 September 2019.^[3] Vaizey had the Conservative whip restored on 29 October 2019.^[4] This meant that, for a brief time, Wantage was represented by an independent MP. David Johnston was selected as the Conservative candidate to represent Wantage and was duly elected as the new MP for Wantage at the 2019 general election.^[5]

The seat, including its forerunner, was won by Conservative Party candidates since 1924. The 2015 result made the seat the 76th-safest of the Conservative Party's 331 seats by percentage of majority.^[6]

All five parties' candidates achieved more than the deposit-retaining threshold of 5% of the vote in 2015. Social Democrat candidate Winifred Tumin won the largest third-party share of the vote to date, in the 1983 election — 32.3% of the vote.

• List of parliamentary constituencies in Oxfordshire
• Banbury (UK Parliament constituency)
• Henley (UK Parliament constituency)
• Oxford East (UK Parliament constituency)
• Oxford West and Abingdon (UK Parliament constituency)
• Witney (UK Parliament constituency)