LDU Quito

Liga de Quito's roots lie in a semi-pro sports team based out of the Central University of Ecuador on 23 October 1918, headed by Dr. César Jácome Moscoso. Under the leadership of Dr. Bolívar León, the club was officially founded on 11 January 1930. In the early days, Liga participated in a variety of disciplines, including football, basketball, athletics, boxing, baseball, swimming, ping-pong, and chess. The club's initial budget was about 500 sucres. The first team's players were students from the university, and had to pay for their own uniforms, medicines, and expenses. Dr. León designed the first uniform, placing its crest, a white "U" on an inverted red and blue triangle, on a white shirt, honoring the team's beginnings at the university. Amongst Liga's first players were Carlos Andrade Marín, Oswaldo Mosquera, Alfonso Cevallos, Alfonso Troya and "El Mono" Icaza.

In 1932, Liga won their first football title at an amateur Pichincha tournament; there was no national amateur league at the time. Five teams participated: Liga, Gladiador, Gimnástico, Atlético, and Cleveland. Liga won all their games, and in the final match, played at the Estadio El Ejido, defeated Gladiador by a score of 4–0. Playing for Liga were Jorge Zapater, Eduardo Flores, Alfonso Cevallos, César González, Jorge Vallarino, Jorge Naranjo, Bolívar "Ñato" León, Alejandro Dávalos, Humberto Yáñez, Humberto Freire, and Ernesto García, with Bolívar León as coach. Liga would also win amateur titles in 1952 and 1953, before the league turned professional the following year.

By 1955, the amateur football association in Pichincha had evolved into the Asociación de Fútbol No Amateur de Pichincha (Pichincha Non-Amateur Football Association), which subsequently organized a professional league for their member clubs from Quito and Ambato. The inaugural Campeonato Professional Interandino (Inter-Andean Professional Championship) was held in 1954. Liga won the league's first title, under the management of Lucho Vásquez. The club finished as the runner-up in 1955 and 1956, before winning again in 1958 under Argentine Roberto Ortega. The club won four titles during the 1960s, in 1960, 1961, 1966, and 1967, and finished as runner-up in 1962, 1963, and 1964. Liga had the most successful run of any professional Interandino-era club, accumulating a total of 6 regional titles.

In 1957 and from 1960 onwards, winning the Interandino title qualified a team to participate in a tournament which crowned a national champion of Ecuadorian professional football. Liga first participated in 1960, after winning the Interandino cup that year. The team's three subsequent Interandino victories did not lead to a national title; the club's best performance was a third-place finish in 1964.

Foreign players became integral to the squad during the 1960s. International players included Paulista José Gomes Nogueira in 1960, Chilean Román Soto in 1961, and Paraguayan José María Ocampo in 1966.

In 1967, all regional tournaments were discontinued in favor of a single national tournament. Liga won its first national championship in 1969, one year after joining the new league, under the leadership of Brazilian José Gomes Nogueira. Liga's ranks at the time included Francisco Bertocchi, Jorge Tapia, Armando "Tito" Larrea, Carlos Ríos, Santiago Alé, Enrique Portilla, and Ramiro Tobar. Liga's victory granted the club its first Copa Libertadores participation in 1970, where it reached the second phase of the tournament, with '"El Tano" Bertocchi tying for the title of top goalscorer of the tournament.

Liga's success was short-lived; in 1972, the club finished seventh of the eight teams participating in the Serie A. At the time, only four teams from the province of Pichincha could play in the top flight. As the worst-performing Pichincha team, Liga took part in a playoff match against the best-performing Pichincha team in Serie B, Universidad Católica, for a berth in the next season's Serie A tournament. Liga lost the match, relegating it to Serie B for the 1973 season, at the end of which the club faced a second relegation, down to the Segunda Categoria of Ecuadorian football. The club was able to gain promotion back to the Serie B in time for the 1974 season. After winning the first stage of the 1974 Serie B, Liga returned to the Serie A after two years in the lower flights. Liga's rise continued as the team won their second national title after defeating El Nacional. The success was followed by another title win in 1975, marking Liga's first back-to-back national championships. Liga's 1975 and 1976 Copa Libertadores participations saw the squad twice reach the semi-finals of the continental tournament. Key to Liga's success were players Polo Carrera, Oscar Zubía, Jorge Tapia, Gustavo Tapia, Walter Maesso, Juan Carlos Gómez, Ramiro Tobar, Juan José Pérez, and Roberto Sussman, along with Colombian coach Leonel Montoya. Liga would round out the decade with a runners-up finish in 1977, allowing for another Copa Libertadores participation in 1978.

In contrast to the team's good performances after coming back from relegation, the 1980s were a dismal decade for the club. Liga's best performance during that period was a runners-up finish in 1981, and a subsequent Copa Libertadores participation in 1982. Player Paulo Cesar was the top Serie A goalscorer in 1981.

In the two decades since 1990, Liga enjoyed a period of domestic success. They started the 1990s with a national title, edging established powerhouse Barcelona. Before the end of the decade, Liga won two more national titles in 1998 and 1999. The 1998 title was won the year Liga inaugurated their new stadium, La Casa Blanca, and ended with an impressive 7–0 win over Emelec.

In 2000, the club experienced a period of crisis. This crisis resulted in a poor performance in the national league and Liga was relegated to the Serie B that season. The club managed to bounce back from relegation and won the Serie B in 2001 to gain promotion back to the Serie A. Two years later in 2003, Liga won their 7th national title. Liga added another four more national titles in 2005 Apertura, 2007, 2010, 2018 and the most recent in 2023 to bring their current count to twelve, placing them fourth all-time domestically.

Prior to 2008, Liga had participated in sixteen international/continental tournaments. Their best success in South American football at the beginning of 2008 was reaching the semi-finals of the 1975 Copa Libertadores, the 1976 Copa Libertadores, and the 2004 Copa Sudamericana.

On 2 July 2008, Liga became the first-ever Ecuadorian team to win the Copa Libertadores, after defeating Fluminense in the finals on penalties 3–1, after being level on aggregate 5–5 at the end of extra time. Liga's Libertadores title gave the club an automatic berth into the semi-finals of the 2008 FIFA Club World Cup, becoming the first non-Argentine or Brazilian CONMEBOL squad to participate in the tournament. Liga defeated Pachuca by 2–0 in their semi-final match, advancing to the final against 2007–08 UEFA Champions League winners Manchester United, where Liga lost on December 21 in Yokohama, Japan, by a score of 1–0.

In June 2009, Liga, as the 2008 Copa Libertadores champion, participated in the 2009 Recopa Sudamericana against the 2008 Copa Sudamericana champion Internacional of Porto Alegre, Brazil. Liga won the first leg, played at Beira Rio stadium in Porto Alegre, by a score of 1–0, with a goal from Claudio Bieler. In the second leg, played at La Casa Blanca, Liga won 3–0 with goals from Carlos Espínola, Claudio Bieler, and Enrique Vera. The 2009 Recopa title was Liga's second international title, as well as being the second international title ever achieved by any Ecuadorian club.

Soon after the Recopa victory, Liga earned their third international trophy in their history, the 2009 Copa Sudamericana. In a rematch of the 2008 Copa Libertadores Final, Liga edged Fluminense 5–4 on aggregate over two legs by winning impressively at home 5–1 and losing 3–0 in Rio de Janeiro. On their way to the finals, they disposed of important clubs, such as Libertad of Paraguay, Argentine clubs Lanús and Vélez Sarsfield, and Uruguayan club River Plate.

With the Copa Sudamericana title, Liga technically achieved a CONMEBOL treble (Copa Libertadores, Copa Sudamericana, Recopa Sudamericana), but since the three titles were not all achieved in the same calendar year, (they were achieved in 17 months), the club narrowly fell short of a traditional treble; Liga would've achieved the treble if they won the 2008 Copa Sudamericana, and even though their Recopa Sudamericana win was in 2009, the treble would have still counted because those were the three back-to-back CONMEBOL tournaments.

Additionally, they qualified to play in the 2010 Recopa Sudamericana against Argentine club Estudiantes de La Plata. They won the first leg 2–1 with both goals coming from Hernán Barcos. The win at home in the first leg was enough to secure the title after both teams drew the second leg 0–0. With this title, Liga became the third team to win back-to-back Recopa Sudamericanas. The victory gave the club the right to play in the 2010 Suruga Bank Championship, which was won by FC Tokyo 4–3 on penalties after a 2–2 draw in August 2010.

Liga also reached the 2011 Copa Sudamericana Finals, which they lost to Universidad de Chile by a global score of 4–0.

In 2023 Liga won its second Copa Sudamericana after defeating Fortaleza Esporte Clube on penalties 4-3, following a 1-1 draw.