Sheffield Hallam is a constituency^{[n 1]} represented in the House of Commons of the UK Parliament since 2019 by Olivia Blake of the Labour Party.^{[n 2]}

The Hallam seat was previously held by Nick Clegg, the former Leader of the Liberal Democrats and Deputy Prime Minister of the United Kingdom until he was unseated by Labour in 2017.

Sheffield Hallam is the only constituency in South Yorkshire that has not been a Labour stronghold, returning a Labour MP for the first time in 2017. Apart from a brief period between 1916 and 1918, when it was taken by the Liberals, it was a Conservative seat from 1885 until 1997, when the Liberal Democrats won it. This long period of Conservative dominance included all three elections under Margaret Thatcher's premiership, starkly contrasting with most seats in the county and the neighbouring county of Derbyshire.

On income-based 2004 statistics, this is the most affluent constituency one place below the top ten seats of the 650, which were spread across the South East of England (including London), with almost 12% of residents earning over £60,000 a year.^[3] This measure placed Sheffield Hallam above Windsor and Twickenham.

Based on 2011–12 income and tax statistics from HMRC,^[4] Sheffield Hallam has the 70th highest median income of the 650 parliamentary constituencies, with those above it almost exclusively in London and the South East, and placing it above Tunbridge Wells (76th), The Cotswolds (92nd), Cambridge (97th), Hemel Hempstead (103rd), and David Cameron's former Witney constituency (121st).

The 2001 Census showed Hallam to have the highest number of people classified as professionals of any of the UK constituencies.^[5] Furthermore, 60% of working-age residents hold a degree,^[6] the 7th highest and exceeding Cambridge.^{[n 3]}

Before the 1997 general election, the constituency was a safe Conservative seat, and was the only Conservative seat in South Yorkshire in the three previous elections to that. From 2005 to 2017, it was represented in the House of Commons by Nick Clegg, who was leader of the Liberal Democrats from 2007 to 2015 and Deputy Prime Minister from 2010 to 2015.

Hallam constituency extends from Stannington and Loxley in the north to Dore in the south and includes small parts of the city centre in the east. It includes the wards of Crookes, Dore and Totley, Ecclesall, Fulwood and Stannington.

The majority of Hallam is rural, spreading in the west into the Peak District National Park. It also contains some of the least deprived wards in the country, has low unemployment (1.5% jobseekers claimants in November 2012)^[7] and a high rate of owner occupancy, with few occupants who rent their home.^[8] Since the 2010 boundary changes, neither of Sheffield's universities have a campus in the constituency^[9] but it still includes areas where many students live.^{[citation needed]}

In the 2017 general election, the Labour Party candidate, Jared O'Mara, won the seat from Clegg.^[10] This was the first time in the seat's history that it had returned a Labour MP.

From 25 October 2017 until 3 July 2018, O'Mara had the whip withdrawn as a Labour MP and sat as an independent. It was later restored but he quit the Labour Party shortly afterwards.^[11] He then sat as an independent MP until leaving parliament.^[12] O'Mara announced he would resign as an MP in September 2019, citing mental health issues, which would have triggered a by-election in the constituency.^[13] However, he later postponed his resignation until the 2019 general election.^[14]

Olivia Blake won the seat for the Labour Party in the 2019 general election.^[15] In her maiden speech to Parliament, Blake said that the Sheffield Hallam constituency had a "very long history of social justice", as mythology points to a Yorkshire origin for Robin Hood in Loxley, thereby lending her support to the idea that Loxley was the birthplace of Robin Hood.^[16]

1885–1918: The Borough of Sheffield wards of Nether and Upper Hallam, and parts of the wards of Ecclesall and St George's.

1918–1950: The County Borough of Sheffield wards of Crookesmoor and Hallam, and part of Broomhill ward.

1950–1955: The County Borough of Sheffield wards of Broomhill, Ecclesall, and Hallam.

1955–1974: The County Borough of Sheffield wards of Broomhill, Crookesmoor, Ecclesall, and Hallam.

1974–1983: The County Borough of Sheffield wards of Broomhill, Dore, Ecclesall, Hallam, and Nether Edge.

1983–1997: The City of Sheffield wards of Broomhill, Dore, Ecclesall, Hallam, and Nether Edge.

1997–2010: The City of Sheffield wards of Broomhill, Dore, Ecclesall, and Hallam.

2010–present: The City of Sheffield wards of Crookes and Crosspool, Dore and Totley, Ecclesall, Fulwood, and Stannington.

Hallam^{[n 4]} borders High Peak, North East Derbyshire, Penistone and Stocksbridge, Sheffield Central, Sheffield Heeley and Sheffield Brightside and Hillsborough.

Prior to its creation Hallam was a part of the larger Sheffield Borough constituency, which was represented by two Members of Parliament (MPs). In 1885 the Redistribution of Seats Act, which sought to eliminate constituencies with more than one MP and for the first time allow approximately equal representation of the people, led to the break-up of the constituency into five divisions: each represented by a single MP, as today. Hallam was one of these new divisions. Its first MP, the Conservative Charles Stuart-Wortley, had previously been an MP in the Sheffield constituency, elected for the first time in 1880.

Hallam was regarded in 2004 as the wealthiest constituency in the north of England^[3] and was held by the Conservative Party for all but two years from 1885 to 1997. At the 1997 general election, Richard Allan of the Liberal Democrats took the seat with an 18.5% swing, becoming only the second non-Tory ever to win it. He handed the seat to fellow Lib Dem and future UK Deputy Prime Minister, Nick Clegg in 2005; who held it until his defeat by Labour's Jared O'Mara at the 2017 snap general election. That year saw the constituency record its highest turnout in 66 years, with 77.8% of the electorate going to the polls.

• List of parliamentary constituencies in South Yorkshire
• Opinion polling for the next United Kingdom general election in individual constituencies