| Noc: | JPN |
| Nocname: | Japanese Olympic Committee |
| Year: | 2023 |
| Date: | August 16 – 23 |
| Games: | East Asian Youth Games |
| Location: | Ulaanbaatar, Mongolia |
| Competitors: | 48 |
| Sports: | 7 |
| Gold: | 22 |
| Silver: | 6 |
| Bronze: | 13 |
| Rank: | 2 |
| Appearances: | auto |
Japan participated in the 2023 East Asian Youth Games in Ulaanbaatar, Mongolia on 16–23 August 2023.[1] [2] The nation sent 48 athletes competing in 7 sports.[3] [4] Japan finished second in the medal table with 22 gold medals, 6 silver medals and 13 bronze medals. 42 of the 48 delegated athletes won medals.
| Medal | Name | Sport | Event | Date |
|---|---|---|---|---|
| Boys' -66 kg | August 17 | |||
| Girls' -52 kg | August 17 | |||
| Boys' +81 kg | August 18 | |||
| Boys' 54–57 kg | August 19 | |||
| Boys' 57–60 kg | August 19 | |||
| Boys' 63.5–67 kg | August 19 | |||
| The King of Fighter XV | August 19 | |||
| Girls' 800 m | August 20 | |||
| Girls' 400 m | August 21 | |||
| Girls' 43 kg | August 21 | |||
| Girls' 57 kg | August 21 | |||
| Boys' 48 kg | August 21 | |||
| Boys' 55 kg | August 21 | |||
| Boys' 65 kg | August 21 | |||
| Boys' 1500 m | August 22 | |||
| Girls' 46 kg | August 22 | |||
| Girls' 53 kg | August 22 | |||
| Boys' 51 kg | August 22 | |||
| Boys' 60 kg | August 22 | |||
| Boys' 80 kg | August 22 | |||
| Girls' cross-country 5 km | August 22 | |||
| Boys' cross-country 5 km | August 22 | |||
| Girls' team | August 18 | |||
| Girls' 52–54 kg | August 19 | |||
| Boys' 48 kg | August 19 | |||
| Girls' 100 m | August 20 | |||
| Girls' 49 kg | August 21 | |||
| Girls' 65 kg | August 22 | |||
| Girls' +63 kg | August 18 | |||
| Girls' 49–55 kg | August 19 | |||
| Boys' 55–63 kg | August 19 | |||
| Boys' 48–51 kg | August 19 | |||
| Boys' 46–48 kg | August 19 | |||
| Boys' 60–63.5 kg | August 19 | |||
| The King of Fighter XV | August 19 | |||
| Girls' long jump | August 20 | |||
| Girls' 44–49 kg | August 20 | |||
| Girls' singles | August 21 | |||
| Girls' doubles | August 21 | |||
| Girls' doubles | August 21 | |||
| Boys' doubles | August 21 | |||
Momoko Yamada
Ion Kondo
Sari Kamei
Haruna Seta
Kotoha Nakano
Daiki Sasaki
Ko Ochiai
Wakushi Narukawa
Miku Oikawa
Amu Ota
Ryuki Waga
Keisuke Akimoto
Shoma Okumura
Fuma Kumamoto
Jo Oikawa
Ryota Ajiki
Riku Saito
Haruki Arai
Keisho Mitsuishi
Kanae Kurata
Yuna Fukushima
Katsuhiro Kaburagi
Misuzu Takeya
Saya Yamamuro
Senri Tsukasa
Sachi Aoki
Takumi Tanimoto
Daito Masaki
Tamito Watanabe
Kazuki Yoshiyama
Otoa Ishida
Ruka Okamoto
Koharu Suzuki
Takato Kato
Ryusei Ohara
Riku Takamaru
Chisato Yoshida
Sowaka Uchida
Sakura Onishi
Rinka Ogawa
Natsumi Masuda
Mona Ezaka
Natsura Okazawa
Keyvan Gharehdaghi
Akito Maehara
Ariya Yoshida
Yamato Ogawa
Yamato Furusawa