McLaren significant person Lando Norris
Honda engines (2015–2017)
For 2015, McLaren ended their engine deal with Mercedes which included buying back the 40% stake that Mercedes held in the team and reforging their historical partnership with Honda. The Honda deal not only meant they would supply engines, but that Honda staff would work with the team at their Woking base as well as received full-factory support from Honda including official team vehicles and free engines. The team announced Fernando Alonso and Jenson Button as their race drivers, with Kevin Magnussen demoted to test driver. During pre-season testing at the Circuit de Barcelona-Catalunya in February, Alonso suffered a concussion and, as a result, Kevin Magnussen replaced him for the season-opening Australian Grand Prix in March. At that inaugural race of the season, Jenson Button finished 11th, but was lapped twice and finished last of the finishing cars. Following considerable unreliability and initial suggestions that the Honda engine was underpowered relative to its competitors, steady performance gains eventually resulted in Button managing to score the team's first (four) points of the season at the sixth round in Monaco. By contrast, Alonso scored his first point three races later at the British Grand Prix.
The Hungarian Grand Prix saw the team score their best result of the season with Alonso and Button finishing fifth and ninth, respectively. However, McLaren did not score points in the next four races until Button finished ninth at the Russian Grand Prix. At the following United States Grand Prix, Button scored his best result of the season with sixth place. The team finished ninth in the constructors' standings with 27 points, McLaren's worst performance since 1980.McLaren retained the Alonso - Button pairing for the 2016 season. The second year of the Honda partnership was better than the first, with the team being able to challenge for top 10 positions on a more regular basis. However, the season started with a massive crash at the Australian Grand Prix in which Fernando Alonso sustained rib fractures and a collapsed lung after colliding with Esteban Gutiérrez and somersaulting into the crash barriers. Alonso, as a result of his injuries, was forced to miss the second round of the Championship, the Bahrain Grand Prix, and was replaced by reserve driver Stoffel Vandoorne. Vandoorne produced an impressive performance in his first race to score the team's first point of the season with 10th place. The next points for McLaren came at the Russian Grand Prix with Alonso and Button finishing sixth and 10th respectively. The rain-affected Monaco Grand Prix was one of best races of the season for the team. Alonso finished fifth, having kept Nico Rosberg's Mercedes behind him for 46 laps, while Button scored two points with ninth. At the Austrian Grand Prix, Button recorded his best result of the season with a sixth-place after qualifying third in a wet/dry session. After a disappointing display at their home race, the British Grand Prix at Silverstone, the team scored points at the next three rounds with six points in Hungary, four in Germany, and six points again thanks to an impressive seventh-place finish from Alonso at the Belgian Grand Prix. At the United States Grand Prix, McLaren matched their Monaco result with 12 points after an attacking race from Alonso saw him claim fifth position while Button once again finished ninth. After a season of significant progress compared to 2015, Alonso and Button finished the championship in 10th and 15th places respectively with the team ending the season in sixth place in the Constructors' Championship with 76 points. On 3 September 2016, Jenson Button announced he would take a sabbatical from Formula One for the 2017 season. He then confirmed on 25 November that he would retire from F1 altogether with Vandoorne being Alonso's new Teammate for 2017.
In February 2017, McLaren signed Lando Norris to their Young Driver Programme.Alonso did not take part in the 2017 Monaco Grand Prix as he was participating in the Indianapolis 500. Instead Jenson Button returned for the one race as his replacement. McLaren finished 2017 9th with 30 points in total.Renault engines (2018–2020)
McLaren announced during the 2017 Singapore Grand Prix weekend that they would split from engine supplier Honda at the end of the 2017 season and had agreed on a three-year customer deal to be supplied with Mecachrome-assembled Renault engines. Team boss Éric Boullier described their performance between 2015 and 2017 as a "proper disaster" for the team's credibility. 2018 was the first season in McLaren's history when their cars were powered by Renault engines. McLaren also announced that Fernando Alonso and Stoffel Vandoorne would remain with the team for the 2018 season. On 6 November 2017, the team announced that Lando Norris would be the team's test and reserve driver.
At the season-opening Australian Grand Prix, Fernando Alonso scored the team's best finish since the 2016 Monaco Grand Prix with fifth, Alonso said that the team's target would be Red Bull Racing. McLaren had a relatively good start to the season with points finishes in the next four races, but in the next 16 races after Spain, McLaren only scored 22 points, 8 points less than in the same period in 2017. On 14 August 2018, Fernando Alonso announced he would not compete in Formula One in 2019, ending his four-year spell at the team. Carlos Sainz Jr. was signed as his replacement on a multi-year deal. On 3 September 2018, it was announced that Stoffel Vandoorne would be leaving the team at the end of the season, with Lando Norris being promoted from reserve driver to replace him in 2019. McLaren struggled with performance throughout the season, with the McLaren drivers being knocked out 21 times in the first qualifying session, and McLaren having the second-worst average qualifying ranking of any team, only ahead of Williams. The team finished the disappointing season – after being helped by the exclusion of Force India's points from the first 12 races – in 6th place with 62 points, 357 points behind their target, Red Bull Racing, with the same engine.
The 2019 season was much more positive for McLaren, with the team securely establishing themselves as the best constructor behind Mercedes, Ferrari, and Red Bull. At the Brazilian Grand Prix, Sainz recorded the team's first podium since the 2014 Australian Grand Prix, finishing fourth on the road but later promoted to third after Lewis Hamilton received a post-race penalty, meaning that the team missed out on the official podium ceremony. McLaren ended the season in 4th place with 145 points, their best result since 2014 and 54 points ahead of their nearest competitor, Renault.
McLaren retained Norris and Sainz for the 2020 season. The season was significantly impacted by the COVID-19 pandemic. The season was shortened to 18 races, with the season opener to take place in Austria. At the Austrian Grand Prix, Norris achieved his first ever podium, finishing in third. Sainz achieved the teams second podium in 2020 at the Italian Grand Prix, where he finished second. The team finished the 2020 season third in the constructors' championship with 202 points. Sainz finished the driver's championship in sixth with 105 points and Norris in ninth with 97 points.Return to Mercedes engines (2021–)
McLaren again used Mercedes engines in 2021 after their deal with Renault ended. McLaren had previously collaborated with Mercedes from 1995 through 2014 (1995 to 2009 was a works partner and later 2010 to 2014 was a customer partner) but this time a customer role system. Daniel Ricciardo moved from Renault to partner Lando Norris for the 2021 Formula One World Championship on a multi-year deal. Ricciardo replaced Carlos Sainz, who moved to Ferrari. In the season's first nine races, the team scored three podiums with Mercedes power, in Italy, Monaco and Austria, all courtesy of Norris.