The eighth night of New Japan Cup 2021 took place on March 14, 2021, at Baycom Gymnasium in Amagasaki, Hyogo, Japan, and featured two second-round matches.
| Actor | Role |
|---|---|
 Luke James Uggles EatwellZack Sabre Jr. | Zack Sabre Jr. |
 William OspreayWill Ospreay | Will Ospreay |
 Yuji NagataYuji Nagata | Yuji Nagata |
 Seiya SanadaSANADA | SANADA |
 Hiroshi TanahashiHiroshi Tanahashi | Hiroshi Tanahashi |
 Joseph RobinsonJuice Robinson | Juice Robinson |
 Aaron HenryToa Henare | Toa Henare |
 Takaaki WatanabeEVIL | EVIL |
 Jamie WhiteJay White | Jay White |
 Yujiro TakahashiYujiro Takahashi | Yujiro Takahashi |
 Hirooki GotoHirooki Goto | Hirooki Goto |
 Kazuchika OkadaKazuchika Okada | Kazuchika Okada |
 Sho TanakaSHO | SHO |
 Tetsuya ShimizuBUSHI | BUSHI |
 Shin TakagiShingo Takagi | Shingo Takagi |
 Tetsuya NaitoTetsuya Naito | Tetsuya Naito |
 Tatsuya HayamaDOUKI | DOUKI |
 Minoru SuzukiMinoru Suzuki | Minoru Suzuki |
 Taichiro MakiTaichi | Taichi |
 Fale SimitaitokoBad Luck Fale | Bad Luck Fale |
 Steven OwensChase Owens | Chase Owens |
 Kenta KobayashiKENTA | KENTA |
 David Stephen Finlay IIIDavid Finlay | David Finlay |
 Yota TsujiYota Tsuji | Yota Tsuji |
 Yuya UemuraYuya Uemura | Yuya Uemura |
 Tomohiro IshiiTomohiro Ishii | Tomohiro Ishii |
 Toru YanoToru Yano | Toru Yano |
 Nobuo YoshihashiYOSHI-HASHI | YOSHI-HASHI |