Derby city centre has been in this constituency since 1974; from 1950 it had been in Derby North.
Historic
1950–1955: The County Borough of Derby wards of Alvaston, Arboretum, Castle, Dale, Litchurch, Normanton, Osmaston, and Peartree.
1955–1974: The County Borough of Derby wards of Alvaston, Arboretum, Castle, Dale, Litchurch, Normanton, Osmaston, and Peartree, and the parish of Littleover in the Rural District of Shardlow.
1974–1977: The Borough of Derby wards of Alvaston, Arboretum, Babington, Chellaston, Litchurch, Littleover, Normanton, Osmaston, and Peartree.
1977–1983: The City of Derby wards of Alvaston, Arboretum, Babington, Chellaston, Litchurch, Littleover, Normanton, Osmaston, and Peartree.
1983–1997: The City of Derby wards of Alvaston, Babington, Blagreaves, Kingsway, Litchurch, Littleover, Normanton, Osmaston, and Sinfin.
1997–2010: The City of Derby wards of Alvaston, Babington, Blagreaves, Kingsway, Litchurch, Littleover, Mickleover, Normanton, Osmaston, and Sinfin.
2010–2023: The City of Derby wards of Alvaston, Arboretum, Blagreaves, Boulton, Chellaston, Normanton, and Sinfin.
Current
Following a local government boundary review which came into effect in May 2023,[2][3] the constituency now comprises the following wards of the City of Derby:
The constituency takes in Derby city centre including much of its varied income inner-city, a narrow majority of which used to be local council-built however which is offset by conservation areas including beside Derby Cathedral and Derby Catacombs. The remainder of the seat is generally more affluent suburbs, and much of the engineering industry traditionally associated with the city.
A notable former MP for the seat was its first incumbent, Philip Noel-Baker of the Labour Party. He served as a Cabinet minister in the post-war Attlee government, and was awarded the Nobel Peace Prize in 1959 for his campaigning for disarmament. He had previously represented the former two-seat constituency of Derby since a by-election in 1936.
The former Cabinet minister Margaret Beckett, who had represented Lincoln (under her maiden name of Margaret Jackson) from 1974 to 1979, represented Derby South for the Labour Party from 1983 until 2024. In 1983, Beckett won the seat with one of the smallest majorities seen of just 421 over the Conservative Party–she always achieved larger majorities since. The 2019 result, in line with other seats that voted for Brexit, saw a drop in votes for Labour, with both the Conservative and Liberal Democrat candidates making gains. Beckett still won a majority of all votes cast, however, representing a higher vote share than in the elections between 2005 and 2015, making Derby South a safe seat for the Labour Party.
^A borough constituency (for the purposes of election expenses and type of returning officer)
^As with all constituencies, the constituency elects one Member of Parliament (MP) by the first past the post system of election at least every five years.