| Hajime Itoi | |
| Fullname: | Hajime Itoi |
| Strokes: | Backstroke, butterfly |
| Collegeteam: | Waseda University |
| Birth Date: | 22 June 1971 |
| Birth Place: | Gifu, Japan |
| Weight: | 700NaN0 |
(born June 22, 1971, in Gifu) is a retired Olympic backstroke swimmer from Japan. He represented his native country at two consecutive Summer Olympics, starting in 1992. He is best known for winning a silver medal at the 1995 Summer Universiade in Fukuoka. He competed for the Waseda University.