| Hiroyuki Hayashi ハヤシヒロユキ | |
| Background: | solo_singer |
| Alias: | Hiro, POLY-1 |
| Birth Date: | 8 August 1978 |
| Birth Place: | Tokyo, Japan |
| Years Active: | 1997–present |
is the founder, guitarist, and lead singer of the Japanese new wave rock group, Polysics.[1] He occasionally works as a remix artist under the alias POLY-1. He is known for having very energetic live performances.