In 1928, Unión de Curtidores, the oldest rival of Club León, was founded.
In 1943, Unión de Curtidores joined the Liga Mayor and merged with Selección de Guanajuato, forming Unión-León, which later became Club León.
On August 20, 1944, the team debuted at Patria Stadium against Atlante, losing 5–3.
In 1944, Club León was founded as Unión-León following the merger of Unión de Curtidores and the Selección de Guanajuato.
In the 1945–46 season, San Sebastián de León placed fourth out of 16 teams.
On May 9, 1946, Florencio Caffaratti accidentally touched an electrical wire after scoring a goal in a match against Club America. Alfonso Montemayor rescued him, and Caffaratti gave Montemayor a gold coin in appreciation.
In the 1946–47 season, notable players joined the team, including Adalberto Lopez, who scored 33 goals.
On June 1, 1947, a match against Atlante, originally scheduled in Mexico City, was moved to León due to a foot-and-mouth disease epidemic.
León won both tournaments of the 1947–48 league consecutively.
León won both tournaments of the 1948–49 league consecutively.
On August 14, 1949, Club León defeated Atlante 3–0 to win the tournament campeonísimo cup.
In 1949, León won both the League and the México Cup, becoming the first Mexican campeonísimo.
In the 1953–54 season, the team finished in third place with 27 points.
In 1957–58, León reached fifth place but won the Cup title.
In the 1960–61 season, León finished in fifth place with 26 points.
In the 1961–62 season, León finished in fifth place with 25 points.
In the 1962–63 season, León finished in ninth place with 25 points.
In the 1963–64 season, León finished in ninth place with 25 points.
In the 1964–65 season, León finished in seventh place with 30 points.
In August 1965, the construction of the stadium commenced.
In the 1965–66 season, León finished in ninth place with 28 points.
In 1966, the construction of the stadium was finalized.
In the 1966–67 season, León finished in fifth place with 34 points.
On 1 February 1967, the stadium was inaugurated with a match between Santos and River Plate. Santos won the match 2–1.
In the 1967–68 season, León finished in fifth place with 35 points.
In the 1968–69 season, León finished in seventh place with 31 points.
In the 1969–70 season, León finished in seventh place with 31 points.
In 1970, for the Mexico 70 Tourney, Luis Grill was replaced and reinstated after Antonio Carbajal left. Sergio Anaya became the contest's scorer with 16 touchdowns, while Luis Estrada marked 13 goals.
In 1972–73, A. Carbajal was replaced by Rafael Albrecht, who served as player and coach. The final game was against Cruz Azul.
In 1973–74, the team failed to qualify, finishing in fifth place with 40 points.
In 1975, when Hugo Sanchez joined Club León, they won the Apertura.
In 1986–87, Jorge Davino scored 10 points in 19 days, starting the 31-day period when León returned to the second division.
In 1990–91, the Esmeraldas returned to the Primera División, coached by Victor Manuel Vucetich.
In 1993, León finished as runners-up for the CONCACAF Champions' Cup.
In 2002, the team were relegated to the Liga de Ascenso.
In 2003, León struggled for their fourth final for promotion after losing against Irapuato.
In 2005, León struggled for their fourth final for promotion after losing against Dorados de Sinaloa.
In 2008, León struggled for their fourth final for promotion after losing against Indios de Ciudad Juárez.
In September 2011, Gustavo Matosas was hired as coach.
On January 7, 2012, Gustavo Matosas began leading León.
On May 10, 2012, Leon returned to the first division and subsequently won the Apertura.
In 2013, León won the Apertura.
León won both tournaments (the Apertura and Clausura) of the 2013–14 season and became the first team in Mexico's history to win two consecutive championship titles twice.
In 2014, León defended their league championship in Clausura, earning them the title of "bicampeones".
In 2014, León won the Clausura.
In 2014, Matosas and León parted ways after failing to make it to the Apertura championship stage. Juan Antonio Pizzi was named as his replacement.
On 31 January 2016, Pizzi left after a 3–1 loss to Tigres UANL, to join Chile as their new manager. He was replaced by Luis Fernando Tena.
In 2016, following a poor start to the Apertura, Tena was let go, and Javier Torrente was brought in.
Since 2016, TUDN holds the U.S. broadcasting rights to León home games.
On 8 March 2017, after legal disputes, it was determined that the Estadio León was the property of the former Club León owners.
In August 2017, Torrente was let go after a year as manager and was replaced by Gustavo Díaz.
On 18 June 2018, Grupo Pachuca unveiled the new stadium project, Nuevo Estadio León, with a projected capacity of 35,000 spectators.
On 18 September 2018, Ignacio Ambríz was named manager of León, replacing Díaz.
During the 2019 Clausura, Ambríz helped León attain the records of most consecutive wins with eleven and the most points attained during the 17-match tournament format (41 points). They faced Tigres UANL in the Clausura championship final but lost.
On 9 October 2020, Club León left the stadium following a ruling on the transfer of ownership, playing the remainder of the season at Estadio Victoria before returning after one game.
In 2020, León won the Guardianes.
On 15 July 2021, Grupo Pachuca announced that they had reached an agreement to purchase Estadio León. The local government financed the deal with an interest-free loan.
On 15 September 2023, Grupo Pachuca announced the cancellation of the new stadium project due to the inability to carry it out. Instead, the Estadio León will undergo renovations.
In 2023, León won the CONCACAF Champions League against Los Angeles FC.
The Nuevo Estadio León was scheduled for completion in 2023.
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