The following is a list of all the squads of the national teams that participated in the 2019 FIFA U-20 World Cup. Each team had to name a preliminary squad of between 22 and 50 players. From the preliminary squad, the team had to name a final squad of 21 players (three of whom must be goalkeepers) by the FIFA deadline. Players in the final squad could be replaced by a player from the preliminary squad due to serious injury or illness up to 24 hours prior to kickoff of the team's first match. Players born on or after 1 January 1999 and on or before 31 December 2003 were eligible to compete in the tournament.
The nationality for each club reflects the national association (not the league) to which the club is affiliated. A flag is included for coaches that are of a different nationality than their own national team. Those marked in bold have been capped at full international level.
Group A Poland Head coach: Jacek Magiera
The final squad was announced on 13 April.
Colombia Head coach: Arturo Reyes
The final squad was announced on 29 April. Yéiler Góez was replaced by Andrés Perea on 15 May due to injury.
Tahiti Head coach: Bruno Tehaamoana
The final squad was announced on 28 April.
Senegal Head coach: Youssouph Dabo
The final squad was announced on 13 May.
Group B
Mexico Head coach: Diego Ramírez
The final squad was announced on 23 April.
Italy Head coach: Paolo Nicolato
The final squad was announced on 14 April.
Japan Head coach: Masanaga Kageyama
The final squad was announced on 7 May.
Ecuador Head coach: Jorge Célico
The final squad was announced on 25 April.
Group C
Honduras Head coach: Carlos Tábora
The final squad was announced on 4 May.
New Zealand Head coach: Des Buckingham
The final squad was announced on 16 April 2019.
Uruguay Head coach: Gustavo Ferreyra
The final squad was announced on 6 May 2019.
Norway Head coach: Pål Arne Johansen
The final squad was announced on 30 April 2019.
Group D Qatar Head coach: Bruno Pinheiro
Nigeria Head coach: Paul Aigbogun
The final squad was announced on 13 May 2019.
Ukraine Head coach: Oleksandr Petrakov
The 25-man provisional squad was announced on 7 May 2019. Vitaliy Mykolenko was replaced by Oleh Veremiyenko on 23 May due to injury.
United States Head coach: Tab Ramos
The 21-man final squad was announced on 10 May. Ayo Akinola was replaced by Julián Araujo on 22 May due to injury.
Group E Panama Head coach: Jorge Dely Valdés
The 23-man provisional squad was announced on 29 April 2019.
Mali Head coach: Mamoutou Kane
France Head coach: Bernard Diomède
The final squad was announced on 13 May 2019.
Saudi Arabia Head coach: Khaled Al-Atwi
Group F
Portugal Head coach: Hélio Sousa
The 22-man provisional squad was announced on 10 May 2019.
South Korea Head coach: Chung Jung-yong
The final squad was announced on 2 May 2019. On 12 May, Lee Kyu-hyuk was announced as a replacement for Jeong Woo-yeong after Bayern Munich declined to release him.
Argentina Head coach: Fernando Batista
The final squad was announced on 3 May 2019.
South Africa Head coach: Thabo Senong
The final squad was announced on 14 May 2019.
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