The 2023 Thessaloniki Municipal election was held on 8 October 2023 to elect the mayor of Thessaloniki and its city council, as part of the 2023 Greek Local elections. It moved to a second round run-off that took place a week later, on 15 October, between incumbent Konstantinos Zervas backed by ND and Independent candidate Stelios Angeloudis. In the second round, Stelios Angeloudis won with almost 67% of the vote, defeating the incumbent Kostantinos Zervas, with almost 30 points ahead, electing 6+20 councilors.
The New Democracy government changed the law on local elections, enacting "Law 4804/2021". As per this law, "The distribution of municipal or regional council seats between the successful and runner-up list is done by a system of Reinforced proportionality, so that the successful combination holds at least 3/5 of the council seats.". Also stating that when it comes to the percentage needed for a list to enter the council and the percentage needed or the elections to lack a second round that "[...] in order for a list to be entitled to at least one seat on the municipal or district council, it must receive at least 3% of the valid ballots in the first round of elections. The combination that received at least 43% of the valid ballots plus one vote in the first round is declared successful and its head is elected mayor or regional governor."