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| FINA code | JPN |
|---|---|
| Nickname(s) | ポセイドン ジャパン(Poseidon Japan)[1] |
| Association | Japan Swimming Federation |
| Confederation | AASF (Asia) |
| Head coach | Yoshinori Shiota |
| Asst coach | Shota Hazui Atsushi Naganuma |
| Captain | Toi Suzuki |
| FINA ranking (since 2008) | |
| Current | 9 (as of 9 August 2021) |
| Highest | 8 (2016, 2017, 2018) |
| Olympic Games (team statistics) | |
| Appearances | 10 (first in 1932) |
| Best result | 4th place (1932) |
| World Championship | |
| Appearances | 11 (first in 2001) |
| Best result | 9th place (2022) |
| World Cup | |
| Appearances | 1 (first in 2018) |
| Best result | 7th place (2018) |
| World League | |
| Appearances | 15 (first in 2006) |
| Best result | 4th place (2018) |
| Asian Games | |
| Appearances | 17 (first in 1954) |
| Best result |  (1958, 1962, 1966, 1970, 2023) |
| Asian Swimming Championships | |
| Best result | (2016) |
| Asian Water Polo Championship | |
| Best result | (2015) |
| Media | |
| Website | swim.or.jp |
The Japan men's national water polo team is the representative for Japan in international men's water polo.