Success and stability

On 15 October 1940, Bordeaux merged with local club AS Port and took on one of the club's most prestigious traditions, the scapular. Bordeaux ASP, which the club was now known, adorned the scapular during its run to the 1941 edition of the Coupe de France final. The match, played in occupied France at the Stade Municipal in Saint-Ouen, saw Bordeaux defeat SC Fives 2–0 with Urtizberea netting both goals. The Coupe de France triumph was the club's first major honour. Following the liberation of France, Bordeaux returned to league play and earned promotion to the first division following its 2nd place finish during the 1948–49 season. After the season, André Gérard, now manager of the club, signed Dutchman Bertus de Harder. Led by the three-headed monster of de Harder, Édouard Kargu, and Camille Libar, Bordeaux captured its first-ever league championship, in just the club's first season in the first division, winning by six points over second place Lille. The league success led to Bordeaux being selected to participate in the second edition of the Latin Cup. In the competition, Bordeaux reached the final drawing 3–3 with Portuguese outfit Benfica. The draw forced a second match with Benfica claiming victory following an extra time goal after over two hours and 25 minutes of play.

Bordeaux maintained its title-winning aspirations finishing runner-ups to Nice two seasons after winning its first title. The club also performed well in cup competitions reaching the Coupe de France final in 1952 and 1955. In 1952, Bordeaux suffered defeat to the team it finished runner-up to the same year, Nice, following a thrilling match in which eight goals were scored with five of them coming in the first 40 minutes. Bordeaux drew the match at 3–3 following a 55th minute goal from Henri Baillot, but Nice countered minutes later with two goals in a span of four minutes to go up 5–3, which was the final result. In 1955, Bordeaux were trounced 5–2 by Lille who went up 4–0 within 35 minutes. The resulting struggles in the cup competitions led to struggles domestically with the club suffering relegation in the 1955–56 season. The club returned to the first division for the 1959–60 season, but failed to make an impact falling back to Ligue 2 after finishing dead last in the standings with 21 points.

Bordeaux returned to its former selves in the 1960s under new manager and former player Salvador Artigas. Under the helm of Artigas, Bordeaux returned to the first division and finished in a respectable 4th place for the 1962–63 season. The following season, Bordeaux returned to the Coupe de France final where the club faced off against Olympique Lyonnais. Bordeaux, once again, were defeated 2–0 courtesy of two goals from the Argentine Nestor Combin. The club's runner-up finish resulted in the team qualifying for the 1964–65 Inter-Cities Fairs Cup. The appearance was brief with the club losing 4–3 on aggregate to German club Borussia Dortmund. Four seasons later, Bordeaux again reached the final of the Coupe de France; the club's seventh appearance overall. The team faced Saint-Étienne and, again failed to match the achievement reached in 1941 losing 2–1. The following season, Bordeaux earned another appearance in the final, but again, failed to win the trophy losing 2–0 to Marseille. The team suffered an extreme decline during the 1970s, despite to arrival of Alain Giresse. The club played under seven different managers during the decade and consistently finished at the bottom half of the table. In 1979, the club was sold to the influential and ambitious real estate mogul Claude Bez, who positioned himself as president of the club.