The 2018 FIFA World Cup was an international football tournament held in Russia from 14 June to 15 July 2018. The 32 national teams involved in the tournament were required to register a squad of 23 players, including three goalkeepers. Only players in these squads were eligible to take part in the tournament.^[1]

A provisional list of 35 players per national team was submitted to FIFA by 14 May 2018, one month prior to the opening match of the tournament.^[2] From the preliminary squad, the final list of 23 players per national team was submitted to FIFA by 4 June, 10 days prior to the opening match of the tournament.^[2] FIFA published the final lists with squad numbers on their website the same day.^[3][4] Teams were permitted to make late replacements in the event of serious injury, at any time up to 24 hours before their first match, where the replacement players did not need to be in the preliminary squad.^[1]

For players named in the 35-player preliminary squad, there was a mandatory rest period between 21 and 27 May 2018, except for those involved in the 2018 UEFA Champions League Final played on 26 May.^[5] Initially the preliminary squads were to have 30 players but, in February 2018, it was announced that the number of players to be named in the provisional squads was increased to 35.^[2]

The position listed for each player is per the official squad list published by FIFA. The age listed for each player is on 14 June 2018, the first day of the tournament. The numbers of caps and goals listed for each player do not include any matches played after the start of the tournament. The club listed is the club for which the player last played a competitive match prior to the tournament.^{[note 1]} The nationality for each club reflects the national association (not the league) to which the club is affiliated. A flag is included for coaches who are of a different nationality than their own national team.