First, a run-down of the particulars:
- Due to potential metric conversion issues, a limit of 126 pounds was observed for this list.
- Inception of the championship occured on 3/27/1992, the first known professional fight taking place at or below 126 pounds.
- Periodic inactivity was not an issue for Flyweights.
- Vacancies after permanent inactivity were filled by the next chronological winner in a Flyweight match. This was the perfect solution, as the permanent inactivity instances seen correlated with huge voids in known Flyweight history. I have a feeling that the other divisions won’t sort themselves out this easily.
Your current lineal Flyweight champion is Ian McCall.
The full history is below. Note, the colored backgrounds indicate a title change.
MMA Flyweight Lineal Championship History
| Date | Champion | Outcome | Challenger | Notes |
| 1992-03-27 | Kenji Ogusu | WIN | Toshio Ando | Inception |
| 1992-07-23 | Kenji Ogusu | WIN | Yoshiaki Murai | |
| 1992-09-25 | Kenji Ogusu | DRAW | Tadashi Murakami | |
| 1993-11-25 | Kenji Ogusu | WIN | Satoshi Fukuoka | Ogusu retired after this fight. |
| 1994-01-14 | Mamoru Okochi | WIN | Tadashi Murakami | Vacant Title |
| 1995-05-12 | Jin Akimoto | WIN | Kazuyoshi Kudo | |
| 1995-06-04 | Jin Akimoto | WIN | Masataka Kawakami | |
| 1996-03-05 | Jin Akimoto | WIN | Yoshinori Haraigawa | |
| 1996-05-07 | Jin Akimoto | DRAW | Mitsuhiro Sakamoto | |
| 1996-10-04 | Mitsuhiro Sakamoto | WIN | Jin Akimoto | |
| 1997-04-06 | Mitsuhiro Sakamoto | WIN | Masaru Gokita | Sakamoto’s last qualifying fight. |
| 2001-01-19 | Toshiteru Ishii | WIN | Tomohiro Hashi | Vacant Title |
| 2001-03-21 | Toshiteru Ishii | WIN | Katsuhisa Akasaki | |
| 2001-09-27 | Homare Kuboyama | WIN | Toshiteru Ishii | |
| 2001-11-25 | Homare Kuboyama | WIN | Tomohiro Hashi | |
| 2002-03-13 | Homare Kuboyama | WIN | Takeyasu Hirono | |
| 2002-07-19 | Homare Kuboyama | WIN | Takeyasu Hirono | |
| 2003-03-18 | Mamoru Yamaguchi | WIN | Homare Kuboyama | |
| 2003-12-14 | Mamoru Yamaguchi | WIN | Yasuhiro Urushitani | 1st Shooto 56kg Championship bout |
| 2004-05-03 | Mamoru Yamaguchi | WIN | Hiroaki Yoshioka | |
| 2004-09-26 | Mamoru Yamaguchi | DRAW | Robson Moura | |
| 2005-01-29 | Mamoru Yamaguchi | WIN | Junji Ikoma | |
| 2005-09-23 | Mamoru Yamaguchi | WIN | Pat Seidel | |
| 2005-12-17 | Mamoru Yamaguchi | WIN | Daiji Takahashi | |
| 2006-03-24 | Mamoru Yamaguchi | DRAW | Shinichi Kojima | |
| 2006-05-12 | Mamoru Yamaguchi | WIN | Setsu Iguchi | |
| 2006-09-08 | Mamoru Yamaguchi | WIN | Erikas Suslovas | 9th Defense – Flyweight Record |
| 2006-10-14 | Shinichi Kojima | WIN | Mamoru Yamaguchi | |
| 2007-03-16 | Shinichi Kojima | DRAW | Yasuhiro Urushitani | |
| 2007-07-15 | Shinichi Kojima | WIN | Yasuhiro Akagi | |
| 2008-07-18 | Shinichi Kojima | WIN | Mamoru Yamaguchi | |
| 2009-01-18 | Shinichi Kojima | DRAW | Jesse Taitano | |
| 2009-03-20 | Shinichi Kojima | WIN | Yuki Shojo | |
| 2009-07-19 | Jussier da Silva | WIN | Shinichi Kojima | |
| 2010-06-12 | Jussier da Silva | WIN | Alexandre Pantoja | 1st Lineal bout outside of Japan |
| 2010-12-02 | Jussier da Silva | WIN | Danny Martinez | 1st Lineal bout in USA, not in Shooto |
| 2011-02-18 | Ian McCall | WIN | Jussier da Silva | |
| 2011-05-06 | Ian McCall | WIN | Dustin Ortiz | |
| 2011-08-05 | Ian McCall | WIN | Darrell Montague |