2017 FIFA U-20 World Cup squads

The following is the squad list for the 2017 FIFA U-20 World Cup. Each squad consisted of 21 players in total, three of whom had to be goalkeepers.
Players names marked in bold have been capped at full international level.

Group A

South Korea

Head coach: Shin Tae-yong

Guinea

Head coach: Mandiou Diallo

Argentina

Head coach: Claudio Úbeda

England

On 19 May, Ezri Konsa replaced injured Rico Henry.
Head coach: Paul Simpson

Group B

Venezuela

Head coach: Rafael Dudamel

Germany

Head coach: Guido Streichsbier

Vanuatu

Head coach: Dejan Gluščević

Mexico

Head coach: Marco Antonio Ruiz

Group C

Zambia

Head coach: Beston Chambeshi

Portugal

On 2 May 2017, Portugal announced their 21-man final list. On 9 May, Hélder Ferreira replaced the injured Aurélio Buta.
Head coach: Emílio Peixe

Iran

Head coach: Amir Hossein Peiravani

Costa Rica

Head coach: Marcelo Herrera

Group D

South Africa

On 17 May, Sirgio Kammies replaced the injured Phakamani Mahlambi.
Head Coach: Thabo Senong

Japan

Head coach: Atsushi Uchiyama

Italy

Head coach: Alberigo Evani

Uruguay

Head coach: Fabián Coito

Group E

France

On 21 May, Faitout Maouassa replaced injured Ronaël Pierre-Gabriel.
Head coach: Ludovic Batelli

Honduras

Head coach: Carlos Tábora

Vietnam

Head coach: Hoàng Anh Tuấn

New Zealand

Head coach: Darren Bazeley

Group F

Ecuador

Head coach: Javier Rodríguez

United States

On 17 May, Auston Trusty replaced the injured Marlon Fossey.
Head Coach: Tab Ramos

Saudi Arabia

Head Coach: Saad Al-Shehri

Senegal

Head Coach: Joseph Koto