United Kingdom and Ireland

The United Kingdom and Ireland is a Smash region that is coterminous with the countries of the same names. The region itself can be divided into 12 smaller regions: East of England, Ireland, London, Midlands, North East England, North West England, Northern Ireland, Scotland, South East England, South West England, Wales, and Yorkshire and the Humber. On an administrative level, the countries are split; however, due to the countries' proximity with each other, the scene is often combined together in Smash, with most of their tournament activity taking place in the England regions.

The United Kingdom and Ireland, especially the former, have historically featured some of Europe's best players for each Smash game, most notably for Melee,  for Smash 4, and  for Ultimate. The region has also hosted several notable Smash tournament series, including those in the, , and series.

Nationally ranked players
These British and Irish players were ranked on the offline European Smash 64 Power Rankings.

Globally ranked players
These British and Irish players were ranked on the SSBMRank 2022. These British and Irish players players have been ranked globally in the past; their highest placement is listed:
 * 59th on the 2013 SSBMRank.
 * 42nd on the 2019 MPGR.
 * 96th on the 2016 SSBMRank.

Nationally ranked players
These British and Irish players were tiered on the MPGRContenders Europe list in 2021. These British and Irish players have been ranked nationally in the past; their highest placement is listed:
 * 33rd in 2019.
 * Originally from Greece. 43rd in 2019.
 * 9th in 2019.
 * 41st in 2019.
 * 42nd in 2018.
 * 36th in 2019.

Globally ranked players
These British and Irish players were ranked on the PGR 100.

Nationally ranked players
These British and Irish players were ranked on the European Smash 4 Power Rankings:

Other notable players

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Globally ranked players
These British and Irish players are ranked on the UltRank 2022 and/or the OrionRank 2022. These British and Irish players have been ranked globally in the past; their highest placement is listed:
 * 69th on the OrionRank Ultimate: Eclipse.
 * 134th on the OrionRank Ultimate: Eclipse.

Nationally ranked players
These British and Irish players were ranked on the PGRU v3 EU. These British and Irish players have been ranked nationally in the past; their highest placement is listed:
 * 50th on the European Smash Rankings.
 * 17th on the European Smash Rankings.

Other notable players

 * Currently resides in Canada.
 * Tournament organizer for.
 * Currently resides in Canada.
 * Tournament organizer for.
 * Currently resides in Canada.
 * Tournament organizer for.

Nationally ranked players
These British and Irish players were ranked on the European Project M Power Rankings.