These are the rosters of all participating teams at the men's water polo tournament at the 2020 Summer Olympics in Tokyo. The twelve national teams were required to submit squads of 12 players. Additionally, teams could name one alternate player. If a player on the submitted squad list suffered an injury or illness, that player would be able to be replaced by the player in the alternate list. On 3 July 2021, the International Olympic Committee (IOC) confirmed that there was a change for the 2020 Summer Olympics, allowing all 13 water polo players named to be available on the roster, with 12 being named for each match. This change was implemented due to the challenges of the COVID-19 pandemic.[1][2] As of 2 August 2021, all players competed in the men's tournament.
Greece's final squad was announced on 3 July 2021.[3]
Head coach: Thodoris Vlachos[4]
Note: Age as of 23 July 2021Source: Greece Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Hungary's final squad was announced on 29 June 2021.[18]
Head coach: Tamás Märcz[19]
Note: Age as of 23 July 2021Source: Hungary Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Italy's final squad was announced on 2 July 2021.[33]
Head coach: Sandro Campagna[34]
Note: Age as of 23 July 2021Source: Italy Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Japan's final squad was announced on 19 May 2021.[48][49]
Head coach: Yoji Omoto[50]
Note: Age as of 23 July 2021Source: Japan Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
South Africa's squad was announced on 24 June 2021.[64][65] Roarke Olver was replaced by Timothy Rezelman.
Head coach: Paul Martin[66]
Note: Age as of 23 July 2021Source: South Africa Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
The United States' final squad was announced on 2 July 2021.[80]
Head coach: Dejan Udovičić[81]
Note: Age as of 23 July 2021Source: United States Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Australia's final squad was announced on 1 July 2021.[95]
Head coach: Elvis Fatović[96]
Note: Age as of 23 July 2021Source: Australia Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Croatia's final squad was announced on 8 July 2021.[110]
Head coach: Ivica Tucak[111]
Note: Age as of 23 July 2021Source: Croatia Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Head coach: Nemanja Knežević[125]
Note: Age as of 23 July 2021Source: Kazakhstan Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Montenegro's final squad was announced on 8 July 2021.[139]
Head coach: Vladimir Gojković[140]
Note: Age as of 23 July 2021Source: Montenegro Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Serbia's final squad was announced on 8 July 2021.[154]
Head coach: Dejan Savić[155]
Note: Age as of 23 July 2021Source: Serbia Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
Spain's final squad was announced on 9 July 2021.[169]
Head coach: David Martín[170]
Note: Age as of 23 July 2021Source: Spain Men | Tokyo 2020 Olympics Archived 2021-07-22 at the Wayback Machine
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