| Championshipname: | Oz Academy Openweight Championship |
| Currentholder: | Ryo Mizunami |
| Won: | October 27, 2024 |
| Promotion: | Oz Academy |
| Created: | October 23, 2006 |
| Mostreigns: | Mayumi Ozaki (4 reigns) |
| Firstchamp: | Aja Kong |
| Shortestreign: | Mio Shirai (4 hours, 2 minutes) |
| Longestreign: | Akino (537 days) |
| Oldest: | Mayumi Ozaki |
| Youngest: | Yoshiko (24 years, 95 days) |
| Heaviest: | Aja Kong (103kg (227lb)))[1] |
| Lightest: | Chikayo Nagashima (52kg (115lb)))[2] |
The Oz Academy Openweight Championship is a women's professional wrestling championship owned by the Oz Academy promotion. The reigning champion is referred to as the "Wizard of Oz".[3] The championship, which is situated at the top of Oz Academy's championship hierarchy, was introduced on March 10, 2007, when Aja Kong defeated Chikayo Nagashima in the finals of a tournament to become the inaugural champion.
Aja Kong was the first champion in the title's history. She also holds the records for most reigns, with three. Akino holds the record for the longest reign, at 537 days, achieved on her first reign. Mio Shirai's only reign of four hours and two minutes is the shortest in the title's history. Overall, there have been twenty-nine reigns shared among eighteen different wrestlers. Mio Momono is the current champion in her first reign.
As of, .
| † | Indicates the current champion |
|---|
| Rank | Wrestler | No. of reigns | Combined defenses | Combined days | |
|---|---|---|---|---|---|
| 1 | 3 | 13 | 1,202 | ||
| 2 | 4 | 9 | 1,172 | ||
| 3 | 2 | 3 | 564 | ||
| 4 | 3 | 7 | 433 | ||
| 5 | 1 | 2 | 395 | ||
| 6 | 3 | 1 | 364 | ||
| 7 | 1 | 3 | 350 | ||
| 8 | 1 | 2 | 315 | ||
| 9 | 1 | 4 | 273 | ||
| 10 | 2 | 1 | 228 | ||
| 11 | 1 | 4 | 217 | ||
| 12 | 1 | 2 | 216 | ||
| 13 | 2 | 0 | 203 | ||
| 14 | 1 | 0 | 112 | ||
| 15 | 1 | 0 | 93 | ||
| 16 | 1 | 0 | 86 | ||
| 17 | † | 1 | 0 | + | |
| 18 | 1 | 1 | 35 | ||
| 19 | 1 | 0 | <1 |