South (Luxembourgish: Süden; French: Sud; German: Süden) is one of the four multi-member constituencies of the Chamber of Deputies, the national legislature of Luxembourg. The constituency was established in 1919 following the introduction of proportional representation for elections to the Chamber of Deputies. It consists of the cantons of Capellen and Esch-sur-Alzette. The constituency currently elects 23 of the 60 members of the Chamber of Deputies using the open party-list proportional representation electoral system. At the 2023 general election it had 111,884 registered electors.

South currently elects 23 of the 60 members of the Chamber of Deputies using the open party-list proportional representation electoral system.^[5][6] Electors votes for candidates rather than parties and may cast as many votes as the number of deputies to be elected from the constituency.^[7][8] They may vote for an entire party list or individual candidates and may cast up to two votes for an individual candidate.^[7][8] If the party list contains fewer candidates than the number of deputies to be elected, the elector may vote for candidates from other lists as long as their total number of votes does not exceed the number of deputies to be elected.^[8][9] The ballot paper is invalidated if the elector cast more votes than the number of deputies to be elected from the constituency. Split-ticket voting (panachage) is permitted.^[7][8]

The votes received by each party's candidates are aggregated and seats are allocated to each party using the Hagenbach-Bischoff quota.^[9][10]