The 2020 EFL Championship play-off final was an association football match which was played on 4 August 2020 at Wembley Stadium, London, between Brentford and Fulham, a West London derby. The match was to determine the third and final team to gain promotion from the EFL Championship, the second tier of English football, to the FA Premier League. The top two teams of the 2019–20 EFL Championship season gained automatic promotion to the Premier League, while the clubs placed from third to sixth place in the table took part in play-off semi-finals; Brentford ended the season in third position while Fulham finished fourth. The winners of these semi-finals competed for the final place for the 2020–21 season in the Premier League. Cardiff City and Swansea City were the losing semi-finalists.

Fulham had been relegated to the Championship the previous season while Brentford had not played at the highest level of English league football for 73 years. The 2020 final was played behind closed doors as a result of the COVID-19 pandemic in the United Kingdom which had delayed the conclusion of the regular league season by more than three months. Refereed by Martin Atkinson, the game was goalless after 90 minutes, sending it into extra time. Fulham's Joe Bryan scored the opening goal in the 105th minute with a long-range free kick and doubled the lead twelve minutes later after build-up play with the league top scorer Aleksandar Mitrović who had come on as a substitute. Henrik Dalsgaard scored an injury-time consolation goal for Brentford as the match ended 2–1 to Fulham, seeing them return to the Premier League on their first attempt.

Brentford finished the regular 2019–20 season in third place in the EFL Championship, the second tier of the English football league system, one place ahead of Fulham on goal difference. Both therefore missed out on the two automatic places for promotion to the Premier League and instead took part in the play-offs to determine the third promoted team. They finished two points behind West Bromwich Albion (who were promoted in second place) and 12 behind league winners Leeds United. The season was affected by the COVID-19 pandemic in the United Kingdom, with the Championship being suspended for more than three months between early March and late June. Upon the resumption of the league, the remaining matches were played behind closed doors.

Fulham finished the regular season with a streak of seven games unbeaten which started with a 2–1 away win against Queens Park Rangers on 30 June. Fulham's opponents in the play-off semi-final were Cardiff City, with the first leg being played at the Cardiff City Stadium on 27 July 2020. Championship top scorer Aleksandar Mitrović was unavailable for Fulham as he was suffering from a hamstring injury. Tom Cairney hit the post for the visitors in an even but goalless first half, but Josh Onomah put them ahead four minutes into the second, beating three defenders before striking the ball past Alex Smithies in the Cardiff goal. The remainder of the match was dominated by Fulham who doubled their lead in injury time with Neeskens Kebano scoring directly from a free kick. The second leg took place at Craven Cottage three days later. Curtis Nelson put the Welsh side ahead with a headed goal after eight minutes but Kebano equalised 24 seconds later, converting a cross from Bobby Decordova-Reid from 12 yards (11 m). Two minutes into the second half, Lee Tomlin, who had come on at half time as a substitute, scored Cardiff's second with a volley. Despite losing the second leg 2–1, Fulham won 3–2 on aggregate to qualify for the final.

Brentford went on an eight-game win streak towards the end of the season, starting with a 5–0 home win against Sheffield Wednesday on 7 March and ending with a 1–0 home win against Preston North End on 15 July, but lost their last two matches before the play-off semi-final. In their play-off semi-final, Brentford faced Swansea City with the first leg being played at the Liberty Stadium in Swansea on 26 July 2020. After a goalless first half, Rico Henry was sent off with a straight red card for a foul on Connor Roberts mid-way through the second half. With nine minutes remaining, a half-volley from André Ayew gave the home team a 1–0 lead which they held on to until the final whistle. The second leg of the semi-final was played three days later at Griffin Park, and was the last match to be hosted at the stadium before Brentford's move to the Brentford Community Stadium. Ollie Watkins levelled the tie after eleven minutes with his 26th goal of the season, and Emiliano Marcondes scored with a header to put Brentford 2–1 ahead on aggregate. Bryan Mbeumo scored with a volley from Henry cross one minute after half-time before Rhian Brewster scored for Swansea with twelve minutes remaining. No further goals were scored and Brentford progressed to the final with a 3–2 aggregate victory.

Fulham had last taken part in a play-off final when they beat Aston Villa in the 2018 final and spent one season in the Premier League before being relegated. Brentford had failed to win in three play-off final attempts: they lost the 1997 Football League Second Division play-off final 1–0 against Crewe Alexandra, were defeated 2–0 in the 2002 Football League Second Division play-off final by Stoke City, and lost to Yeovil Town in the 2013 Football League One play-off final 2–1. They had also lost in five play-off semi-finals. Brentford had not played in the top flight of English football for 73 years, having been relegated to the second tier in their 1946–47 season. Fulham lost both West London derbies played between the clubs during the regular season, suffering a 1–0 defeat at Griffin Park in December 2019, and losing 2–0 at Craven Cottage the following June. Brentford's Watkins and Fulham's Mitrović tied for the distinction as Championship top scorers with 26 goals each. According to bookmakers, Brentford went into the final as favourites. The match was broadcast live in the UK on Sky Sports Football, Sky Sports Main Event and Sky Sports Ultra HD.

The referee for the match was Martin Atkinson, with assistants Lee Betts and Constantine Hatzidakis. Peter Banks acted as the fourth official. It was reported by Deloitte that the game was worth around £160 million to Brentford should they win, or £135 million to Fulham if they were victorious. Brentford made just one change to the starting eleven which beat Swansea in the second leg of the play-off semi-final, with Josh Dasilva replacing Marcondes in midfield, the latter being named as a substitute. Denis Odoi and Aboubakar Kamara came in for Cyrus Christie and Anthony Knockaert in Fulham's starting line-up, and Mitrović was selected on the bench. Faryl Smith sang the national anthem from outside the stadium before the match.

After the teams had taken a knee in honour of the Black Lives Matter movement, Fulham kicked off the match behind closed doors. After two minutes, a Brentford free kick enabled Henrik Dalsgaard to shoot but his strike was blocked. Three minutes later, a Fulham break saw De Cordova-Reid pass to Onomah whose low shot was saved by David Raya in the Brentford goal. On seven minutes, Michael Hector fouled Saïd Benrahma on the edge of the Fulham penalty area, but the resulting free kick was eventually gathered by Marek Rodák. In the 14th minute, a cross from Kebano was deflected out for a corner which was cleared by Pontus Jansson. Four minutes later, Raya made a one-handed save to deny Onomah from opening the scoring for Fulham. On 20 minutes, De Cordova-Reid's shot was deflected out for a corner, and six minutes later the game was paused for a drinks break. In the 29th minute, Harrison Reed was shown the first yellow card of the game after a foul on Christian Nørgaard. Odoi's 41st minute shot was blocked before Raya caught a Fulham cross three minutes later, and the half ended goalless.