| Seiji Saito | |
| Fullname: | Seiji Saito |
| Birth Date: | 27 May 1986 |
| Birth Place: | Saitama, Japan |
| Position: | Midfielder |
| Youthyears1: | 2003–2005 |
| Youthclubs1: | São Paulo |
| Years1: | 2005–2006 |
| Clubs1: | São Paulo |
| Years2: | 2006–2007 |
| Clubs2: | AD Guarujá |
| Years3: | 2007–2008 |
| Clubs3: | Mixto |
| Years4: | 2008–2010 |
| Clubs4: | AD Guarujá |
| Years5: | 2010 |
| Clubs5: | Jacareí |
| Years6: | 2010–2011 |
| Clubs6: | Kashiwa Reysol |
| Years8: | 2011–2012 |
| Clubs8: | CF Fão |
| Caps8: | 5 |
| Goals8: | 0 |
| Years9: | 2012 |
| Clubs9: | Warriors FC |
| Caps9: | 5 |
| Goals9: | 1 |
| Years10: | 2012 |
| Clubs10: | Korona Kielce |
| Caps10: | 0 |
| Goals10: | 0 |
| Years11: | 2013–2014 |
| Years12: | 2015 |
| Clubs12: | FK Tukums 2000 |
| Caps12: | 6 |
| Goals12: | 0 |
| Years13: | 2016 |
| Clubs13: | PSM Makassar |
| Years14: | 2016–2017 |
| Clubs14: | Sitra Club |
| Years15: | 2017–2019 |
| Clubs15: | Chao Pak Kei |
| Years16: | 2021 |
| Clubs16: | AD Cariari Pococí |
| Nationalteam1: | Japan U20 |
| Nationalcaps1: | 20 |
| Nationalgoals1: | 8 |
(born 27 May 1987) is a Japanese former professional football player who played as a midfielder.
He played top league Kashiwa Reysol in Japan. And he also played in Japan national team U15,16,17,18,20. He moved to São Paulo FC in Brazil when he was 16 years old. He played for three years at São Paulo FC. He then played in Brazil for eight years. And he played as a professional player in Portugal, Latvia, Indonesia, India, Singapore, Bahrain. He also played in Polish club Korona Kielce.
On 24 November 2017, Chao Pak Kei signed Saito to a one-year contract.[1]
Saito has represented Japan at numerous youth levels. He was a member of the Japan team for the Japan U15, U16, U18, U20, U21 tours in England.