On February 28, 1904, the Catataus Group and members of Associação do Bem met to form Sport Lisboa, a football club composed of Portuguese players only. José Rosa Rodrigues was appointed as club president.
In 1904, José da Cruz Viegas selected Benfica's kit with red and white colors.
On January 1, 1905, Sport Lisboa played their first ever match, scoring their first goal in the process.
In May 1907, eight players moved from Sport Lisboa to Sporting CP, threatening Sport Lisboa's existence and sparking the rivalry between the two clubs.
In 1907, the rivalry between Benfica and Sporting CP started when eight prominent Benfica players defected to Sporting.
On September 13, 1908, Sport Lisboa acquired Grupo Sport Benfica by mutual agreement and changed its name to Sport Lisboa e Benfica, incorporating elements from both clubs into the new entity.
In 1908, Sport Lisboa absorbed Grupo Sport Benfica and the origin of the current crest goes back to that time.
On April 28, 1912, the rivalry between Benfica and FC Porto started with a friendly match.
In 1913, Benfica moved to their first football grass field, Campo de Sete Rios.
In 1925, Benfica moved to their own stadium, the Estádio das Amoreiras.
In 1930, the shape of the Benfica crest was changed.
In 1934 the Portuguese league was established and Benfica is one of the teams that have never been relegated from it since then.
In 1935-36, Benfica won the Primeira Liga championship, marking the beginning of their first tri.
In 1936, during the Spanish Civil War, the Portuguese Estado Novo's Censorship Commission censored the word "vermelhos", so Benfica became known as Encarnados.
In 1940, Benfica moved from Estádio das Amoreiras.
In 1940, Benfica moved to the Estádio do Campo Grande and also won the Taça de Portugal.
In 1941-42, Benfica won the Primeira Liga championship.
On November 28, 1942, the weekly newspaper O Benfica was first published.
In 1943, Benfica achieved their first double (dobradinha) by winning both the Primeira Liga and the Taça de Portugal.
In 1944–45, Benfica's white alternative kit was officially used for the first time due to Salgueiros also wearing red upon promotion to the first division.
In 1949-50, Benfica won the Primeira Liga title.
In 1950, Benfica achieved their first international success by winning the Latin Cup against Bordeaux at the Estádio Nacional in Lisbon.
In 1952, Joaquim Ferreira Bogalho was elected as president, marking the start of a modernization period for Benfica.
Since 1952, Benfica has had supporters' clubs known as Casas do Benfica, places for cultural, social and sport interaction among benfiquistas, in some countries.
In 1954, Benfica began playing at the Estádio da Luz in Lisbon.
In 1954, coach Otto Glória arrived, modernizing and professionalizing Benfica, and the club moved into the original Estádio da Luz.
In 1954, the original Estádio da Luz was built, serving as Benfica's home ground before being replaced in 2003.
In 1955, Benfica won the Primeira Liga title, but were not invited to the inaugural European Cup.
On October 1, 1957, O Benfica Ilustrado was launched as a monthly supplement to the newspaper O Benfica.
From 2001-02 and '02-03, Benfica were absent from European competition for the first time since 1958-59.
In 1959-60, Benfica won the Primeira Liga title.
In 1960, the seating capacity of the original Estádio da Luz was expanded to 70,000.
In 1960-61, Benfica won the Primeira Liga title.
In 1961, Benfica won the European Cup and became runners-up at the Intercontinental Cup.
In 1961, led by coach Béla Guttmann, Benfica won the European Cup against Barcelona (3–2).
In 1962, Benfica secured their second consecutive European Cup victory, and were runners-up at the Intercontinental Cup, marking a unique achievement in Portuguese football.
In 1963, Benfica finished as runner-up in the European Cup.
On February 14, 1965, Benfica's record-breaking 48-match unbeaten run in all competitions ended. The run began in December 1963.
In 1965, Benfica reached the European Cup final, losing to Inter Milan, and were ranked first in European football.
In 1965–66, Benfica achieved the overall record for the biggest aggregate win in the UEFA Champions League tournament.
In 1968, Benfica reached the European Cup final but lost to Manchester United. They were also presented with the France Football European Team of the Year award.
In 1970-71, Benfica won the Primeira Liga title.
In 1972-73, Benfica became the first undefeated champions in the domestic league.
From October 1976, Benfica began a streak of 56 matches unbeaten in the league.
Until September 1978, Benfica were unbeaten in the league for 56 matches.
In 1979, Benfica admitted foreign players into the team, becoming the last Portuguese club to do so.
In 1980-81, Benfica became the first club to win all Portuguese trophies in one season, including the Supertaça de Portugal, Primeira Liga, and Taça de Portugal.
In 1982-83, Benfica won the Primeira Liga title.
In 1983, Benfica finished as runner-up in the UEFA Cup, now known as the UEFA Europa League.
In 2013-14, Benfica won the club's first back-to-back league titles since 1984.
From 1985 to 1987, Estádio da Luz had a capacity of 120,000.
In 1985, Benfica opened the third tier of the Estádio da Luz, making it the largest stadium in Europe.
In 1986, Benfica clinched the domestic double of Primeira Liga and Taça de Portugal.
From 1985 to 1987, Estádio da Luz had a capacity of 120,000.
In 1988, Benfica reached the European Cup final but lost to PSV Eindhoven.
In the 1988–89 season, Benfica's record for the lowest number of goals conceded in the Primeira Liga was achieved under coach Toni, with 15 goals in 38 matches.
In 1988-89, Benfica won the Primeira Liga title and Super Cup.
From 1994 to 2003, Benfica had eleven coaches.
In 1993-94, Benfica won the Primeira Liga title.
In 2003–04, Benfica ended their longest silverware drought since 1994 by winning the Taça de Portugal.
In 1999, Benfica suffered their biggest defeat in European competitions, losing 7–0 to Celta de Vigo.
In 1999, the shape of the Benfica crest was changed and the eagle was modified and repositioned with a reduction of the wheel's size.
On February 10, 2000, Benfica created Sport Lisboa e Benfica – Futebol, SAD (a public limited sports company) with an initial equity of €75 million.
In 2000, club members approved the construction of the new Estádio da Luz.
In 2000-01, Benfica had their lowest ever league finish, placing sixth.
The Estádio da Luz was demolished between 2002 and 2003.
From 1994 to 2003, Benfica had eleven coaches.
In 2003, Benfica implemented mandatory electronic voting, a voting method that has been criticized by members of Benfica.
In 2003, Benfica's home ground became the Estádio da Luz, replacing the original stadium that was built in 1954. The new stadium marked a significant upgrade for the club's facilities.
In 2003–04, Benfica ended their longest silverware drought by winning the Taça de Portugal.
In April, Benfica and Adidas renewed their previous ten-season contract of 2003 until 2021, for around €4.5 million per year.
On January 27, 2004, Benfica retired squad number 29 in memory of Miklós Fehér, who had passed away while playing for the team two days prior.
By 2005, the weekly newspaper O Benfica had a circulation of close to 10,000.
In 2005, Benfica's training ground and youth academy, Benfica Campus, was built in Seixal, Lisbon Region.
In 2005-06, Benfica reached the quarter-final stage of the UEFA Champions League after eliminating then European champions Liverpool.
According to a study published in 2006, Benfica has approximately 14 million supporters worldwide.
In 2006, Benfica had an estimated 14 million supporters worldwide, highlighting its global reach and popularity.
On 21 May 2007, Benfica SAD entered the PSI-20 with an initial stock value of €5 on 15,000,001 shares.
From December 6, 2007, Benfica published the quarterly magazine Mística.
In 2007-08, Benfica finished fourth in the league.
In 2008, Benfica launched its own sports-oriented television network, Benfica TV (BTV).
Starting in the 2008 season, Benfica football shirts displayed three stars above the crest, with each star representing ten league titles won by the club.
Following the general assembly of 23 December 2009, the SAD increased its €75 million equity to €115 million by absorbing Benfica Estádio, to come out of technical insolvency.
In 2009, Benfica won their first Taça da Liga, becoming the first club to win all major Portuguese competitions.
In 2009, Jorge Jesus was appointed as coach of Benfica, a position he held until 2015.
In 2010, Benfica shirts displayed a commemorative crest with one star, marking the 50-year celebration of their first European Cup.
In 2010-11, Benfica reached their first European semi-final in 17 years at the Europa League.
In 2010-11, Benfica reached their first European semi-final in 17 years at the Europa League.
In 2011, Benfica shirts displayed a commemorative crest with two stars to celebrate their second consecutive European Cup.
According to a study performed for UEFA in 2012, Benfica is the European club with the highest share of football supporters in its own country (47%).
In the 2011-12 campaign, Benfica appeared in the Champions League quarter-finals.
On July 26, 2013, the Museu Benfica – Cosme Damião was inaugurated, opening to the public three days later.
In 2013, Benfica finished as runner-up in the UEFA Europa League.
In 2013-14, Benfica won an unprecedented treble in Portuguese football, including the league, cup, and league cup.
On 31 July 2014, the SAD completed the acquisition of Benfica Stars Fund by spending roughly €28.9 million for 85% of units, thus purchasing the remaining economic rights of nine players.
In 2014, Benfica achieved the first ever treble of Primeira Liga, Taça de Portugal, and Taça da Liga.
In 2014, Benfica finished as runner-up in the UEFA Europa League and were ranked seventh all-time among UEFA clubs in European finals.
In 2014, according to a study by Movimento Por Um Futebol Melhor, Benfica had 270,000 members and was the biggest club in the world in membership terms.
In 2014, the Estádio da Luz was the venue for the UEFA Champions League final.
In 2014, the Museu Benfica – Cosme Damião was considered the Best Portuguese Museum.
In May 2015, the airline Emirates signed a three-year sponsorship deal worth up to €30 million to become Benfica's main jersey sponsor.
In 2015, Jorge Jesus's six-season span as coach ended, during which Benfica won 10 domestic trophies. The club was also ranked sixth in the UEFA team ranking.
In the 2015–16 campaign, Benfica amassed 88 points in 34 matches, setting the club's points record since the league is contested by 18 teams.
In the 2016–17 season, the highest home attendance record was set; 64,519 spectators saw Benfica's 5–0 win over Vitória de Guimarães in the season's last match at Da Luz.
Until 2016, Benfica TV broadcasted three seasons of the English Premier League, and one season of the Italian Serie A and French Ligue 1.
In June 2017, Benfica had earned €617 million from player transfers since the 2010–11 season, surpassing all other clubs worldwide in transfer revenue.
On July 11, 2017, Benfica ended publishing the quarterly magazine Mística.
By October 2017, Benfica was the 5th highest-scoring team in UEFA competition history, with 655 goals in 405 matches (1.62 per match).
In 2017, Benfica won the Super Cup after re-achieving a 36-year-old treble.
In September 2018, Benfica SAD announced a profit of €20.6 million and revenue of €206.2 million. The club also reported a record equity of €86.8 million, with assets of €485.1 million and liabilities of €398.3 million, marking the first time since 2010-11 that debt fell below €400 million.
In May 2019, Brand Finance ranked Benfica as the 40th most valuable football brand.
In January 2020, Benfica launched Benfica Play (BPlay), an over-the-top media service.
In May 2020, the Portuguese Securities Market Commission rejected Benfica's bid to take over 28.06% of Benfica SAD for €5 a share because the funding source was the SAD itself.
In 2020, Jorge Jesus returned to Benfica amidst the COVID-19 pandemic, marking the beginning of the biggest spending spree in Portuguese football.
In 2020, the Estádio da Luz was the venue for the UEFA Champions League final.
By September 2021, Benfica owned the majority of Benfica SAD's share capital at 63.65%, with 40% directly held by the club (category A shares) and 23.65% by its holding company, Benfica SGPS (category B shares).
In April, Benfica and Adidas renewed their previous ten-season contract of 2003 until 2021, for around €4.5 million per year.
In the 2022–23 season, Benfica had an average home attendance of 57,108 in the Portuguese league, the highest average of the competition and current record at the Estádio da Luz, with an average occupancy of 89.12%.
In 2023, Benfica was ranked 20th in the club coefficient rankings by UEFA at the end of the 2023–24 season.
In 2023, Benfica won the Super Cup.
In February 2025, Benfica reached 400,000 club members, solidifying its position as the largest sports club in the world by membership.
In May 2025, United States-based company Lenore Sports Partners acquired a 5.24% minority stake in Benfica SAD. The shares included stock previously seized from former president Luís Filipe Vieira and auctioned.
In 2025, Benfica debuted at the FIFA Club World Cup and also won the league cup and super cup.
In 2025, new statutes were approved by 91% of the votes of 8241 members, including optional electronic voting and other changes.
In February 2025, with 400,000 members, Benfica became once again the largest sports club in the world by membership.
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