| Joshiro Maruyama | |
| Native Name: | 丸山 城志郎 |
| Native Name Lang: | ja |
| Nationality: | Japanese |
| Birth Date: | 11 August 1993 |
| Birth Place: | Miyazaki, Miyazaki Prefecture, Japan |
| Height: | 167 cm |
| Weight Class: | 66 kg |
| Dan: | 4 |
| Club: | Tenri University Miki House |
| Worlds Rank: | 1 |
| Worlds Year: | 2019 |
| Worlds Weight: | Men's 66 kg |
| Worlds Year2: | 2021 |
| Worlds Weight2: | Men's 66 kg |
| Regionals Type: | AS |
| Regionals Rank: | 2 |
| Regionals Year: | 2018 |
| Regionals Weight: | Men's 66 kg |
| Updated: | 2 February 2024 |
is a Japanese judoka.
Maruyama won a gold medal at the 2019 World Judo Championships.[1]