Loudéac (; ; Gallo: Loudia) is a commune in the Côtes-d'Armor department, Brittany, northwestern France.
Loudéac has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Loudéac is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Loudéac was on 9 August 2003; the coldest temperature ever recorded was on 2 January 1997.
The inhabitants of Loudéac are known in French as Loudéaciens and Loudéaciennes.
Loudéac has 2 football teams, FC Saint-Bugan, named after an area in the town, and Loudéac OSC, formed from the amalgamation of Stade Loudéacien (1909) and Avenir Sportif Loudéacien (1966) on 1 June 2001. Loudéac OSC is traditionally a big club on the amateur scene in the region (being one of the larger towns). Recently, the club has restructured with a strong policy on developing youth, which has paid dividends as the club are again rising through the divisions. There is also a female team within the club. There is a handball team in the town, l'Amicale Laîque Loudéac Handball who compete across male and female senior and junior competition. A rugby team based in the town is named the Loup'déaciens (a play on words on the word 'loup' which means 'wolf' in French. There is a strong local pool scene, which has culminated in a youth based in the town becoming a world champion at youth level as part of a French team.
Discussions to build a covered Velodrome in Loudeac started in 2013, in 2018 the council held a vote and approved the construction with 62 votes for, 3 against and 3 abstentions. Construction began in January 2022 and was completed in July 2023 costing an estimated 13 million Euros, the velodrome subsequently opened in September 2023. Named 'Vélodrome de Bretagne' it has a 200 metre wooden track and a 1500 person capacity with 500 seats.