| Daiki Nishiyama | |
| Nationality: | Japanese |
| Birth Date: | 20 November 1990 |
| Weight Class: | 90 kg, 100 kg |
| Worlds Rank: | 2 |
| Worlds Year: | 2010 |
| Worlds Weight: | Men's 90 kg |
| Worlds Year2: | 2011 |
| Worlds Weight2: | Men's 90 kg |
| Regionals Type: | AS |
| Regionals Rank: | 2 |
| Regionals Year: | 2011 |
| Regionals Year2: | 2015 |
| Updated: | 17 July 2023 |
is a Japanese judoka. He won the silver medal in the middleweight (90 kg) division at the 2010 and 2011 World Judo Championships. Because of nishiyamas ranking and recent form it has come as even more of a surprise that he was not includeded in the Japan squad for the 2012 Olympics. The Japanese judo association instead went with the more experienced masaeshi nishiyamam in the 90 kg category.