
The 2018 British Indoor Athletics Championships was held on 17 and 18 February 2018 at the Arena Birmingham in Birmingham, England. The event served as the team trials for the 2018 IAAF World Indoor Championships.

The 2018 British Athletics Championships was the national championship in outdoor track and field for athletes in the United Kingdom, held from 3–5 July 2018 at Alexander Stadium in Birmingham. It was organised by UK Athletics. A full range of outdoor events were held up to 5000 metres. The competition served as the main selection event for the 2018 European Athletics Championships and the 2018 Athletics World Cup.

The United Kingdom competed under the team name of Great Britain and Northern Ireland at the 2018 European Athletics Championships in Berlin, Germany, from 6-12 August 2018. British Athletics named a team of 102 athletes on 24 July 2018, the largest British team sent to an athletics competition since the 1908 Olympic Games. Alyson Dixon was selected for the marathon, but withdrew due to injury. Dai Greene was voted to be the captain of the team, but he withdrew from competition due to injury on the first day of championships.

The 2018 European BMX Championships were held in Glasgow, United Kingdom, on 10 and 11 August 2018. The championships are part of the first European Championships with other six sports events happening in Glasgow and Berlin.

The 2018 European Championships were the first edition of the European Championships. It was a multi-sport event which took place in Berlin, Germany, and Glasgow, Scotland, United Kingdom from 2 to 12 August 2018. Around 1,500 athletes competed at the European Athletics Championships in Berlin, whilst at the same time more than 3,000 took part in the other championships in Glasgow. Each European Championship will be organised by the respective federation and host city.

The 2018 European 10,000m Cup take place on May 19, 2018. The races took place on Parliament Hill Athletics Track in London, Great Britain. The event was held together with the annual Night of the 10,000m PB's meeting.

The 2018 European Cycling Championships were held in Glasgow, United Kingdom, from 2 to 12 August 2018, the championships were part of the first European Championships with other six sports events happening in Glasgow and Berlin.

The 2018 European Mountain Bike Championships was held in Glasgow, United Kingdom, on 8 August 2018, the championships are part of the first European Championships with other six sports events happening in Glasgow and Berlin.

The 2018 European Road Cycling Championships was the 24th running of the European Road Cycling Championships, and took place from 12 to 15 July 2018 in Brno, Czech Republic for the under-23 and junior events, and from 5 to 9 August 2018 in Glasgow, United Kingdom for the elite events. The event consisted of a total of 6 road races and 6 time trials, regulated by the Union Européenne de Cyclisme (UEC).

The 2018 UEC European Track Championships was the ninth edition of the elite UEC European Track Championships in track cycling and took place at the Sir Chris Hoy Velodrome in Glasgow, Scotland, between 2 and 7 August 2018. The event was organised by the European Cycling Union. All European champions were awarded the UEC European Champion jersey which may be worn by the champion throughout the year when competing in the same event at other competitions.

The 2018 European Triathlon Championships were held in Glasgow, United Kingdom, from 9 to 11 August 2018. The championships were part of the first European Championships with six other sports events taking place in Glasgow and Berlin.

The 2018 British Grand Prix was a Formula One motor race held on 8 July 2018 at the Silverstone Circuit in Silverstone, United Kingdom. The race was the 10th round of the 2018 Formula One World Championship. It marked 73rd running of the British Grand Prix, the 69th time that the race had been run as a World Championship event, and the 52nd time that the World Championship event had been held at the Silverstone Circuit.

The United Kingdom, competing under the team name "Great Britain and Northern Ireland", was one of the host nations of the inaugural 2018 European Championships in Berlin, Germany and Glasgow, United Kingdom. Great Britain and Northern Ireland competed at the championships which lasted from 2 to 12 August 2018. Great Britain and Northern Ireland competed in 7 sports.

Great Britain participated at the 2018 Summer Youth Olympics in Buenos Aires, Argentina from 6 October to 18 October 2018.

Anthony Joshua vs. Joseph Parker, billed as Road to Undisputed, was a professional boxing heavyweight unification match contested between Anthony Joshua and Joseph Parker. The event took place on 31 March 2018 at Principality Stadium in Cardiff, Wales, with Joshua's WBA (Super), IBF, and IBO titles and Parker's WBO title on the line. Joshua won the fight by unanimous decision, marking the first time he went the distance. Two judges scored it 118–110 and the other 119–109 all in favor of Joshua

The United Kingdom of Great Britain and Northern Ireland competed at the 2018 Winter Paralympics in Pyeongchang, South Korea, from 9 to 18 March 2018. They were known by the shortened name of Great Britain, for identification purposes.
The 2018 Tour of Britain was an eight-stage men's professional road cycling race. It was the fifteenth running of the modern version of the Tour of Britain and the 78th British tour in total. The race started on 2 September in Pembrey Country Park and finished on 9 September in London. It was part of the 2018 UCI Europe Tour. The French rider Julian Alaphilippe of Quick-Step Floors won the race.

The 2018 UK & Ireland Greyhound Racing Year was the 93rd year of greyhound racing in the United Kingdom and Ireland.

Great Britain competed at the 2018 Winter Olympics in Pyeongchang, South Korea, from 9 to 25 February 2018, with 58 competitors in 11 sports. They won five medals in total, one gold and four bronze, ranking 19th in the medal table.