M-O
| Luchador | Entrenador |
| Malice | Bam Bam Bigelow y Iron Mike Sharp Wrestling Academy |
| Manabu Nakanishi | Joe Malenko y Karl Gotch |
| Marcos | HC Loc |
| Marcus Cor Von | Dan Severn |
| Mark Briscoe | CZW Training School, ECWA's Wrestletech, Glenn Osbourney Jon Dahmer |
| Mark Henry | The Harts |
| Mark Jindrak/Marco Corleone | WCW Power Plant |
| Masahiro Chono | Lou Thesz y Stu Hart |
| Masato Tanaka | Atsushi Onita |
| Matt Bentley | Paul Diamond, Rudy Gonzalez y Shawn Michaels |
| Matt Cross/M-Dogg20 | Cleveland All Pro Training Center y JT Lighting |
| Matt Hardy | Dory Funk Jr. |
| Matt Morgan | Al Snow, Hardcore Holly e Ivory |
| Matt Striker | Johnny Rodz |
| Matt Stryker | Les Thatcher |
| Matt Sydal | Gateway Championship Wrestling |
| Maven | Al Snow y Tazz |
| MAZADA | Tatsumi Fujinami |
| Meng | Giant Baba |
| Mephisto | Astro Rey, El Gallo Giro, Franco Colombo, Negro Casas, Pacoman y Rey Halcón |
| Messiah | Carlito Montana, Dynamite D y Slam U Training School |
| Mick Foley | Dominic DeNucci |
| Mideon | Steve Keirn |
| Mike Knox | Navajo Warrior |
| Mike Quackenbush | Ace Darling y Jorge Rivera |
| Mike Sanders | WCW Power Plant |
| Mike Von Erich | Fritz Von Erich |
| Mikey Batts | Billy Kidman, NWA Florida School y Roderick Strong |
| Mikey Whipwreck | Sonny Blaze |
| Mil Máscaras | Diablo Velasco y José Hérmes |
| Milano Collection AT | Skayde y Ultimo Dragon |
| Místico | Dr. Karonte y Tony Salazar |
| The Miz | Al Snow y Bill DeMott |
| Montel Vontavius Porter | Norman Smiley y Soul Man Alex G. |
| Mr. Aguila | Diablo Velasco y Flash I |
| Mr. Kennedy | Eric Hammers, Mike Mercury y OVW |
| Muhammad Hassan | Eugene |
| Nathan Jones | Mike Bell y Tom Howard |
| Negro Casas | Pepe Casas, Raúl Reyes, Rodolfo Ruiz y Tony Sugar |
| Nick Berk | Hawkins Brothers Wrestling Gym y The Wild Samoan Wrestling School |
| Nick Gage | CZW Wrestling School y John Zandig |
| Nick Mondo | Bodyslammers Gym |
| Nigel McGuinness | HWA |
| Norman Smiley | Rusty Brooks |
| NOSAWA Rongai | Ark Angel, Negro Casas y Shogun Wakamatsu |
| Nunzio | Billy Robinson |
| Oman Tortuga | Jeff Libolt |
| Oriental | Blue Panther y Dr. Wagner |
| Original Tiger Mask | NJPW Dojo |
| Orlando Jordan | Rocky Johnson |
| Osamu Nishimura | Dory Funk Jr., Hiro Matsuda y Karl Gotch |
| Owen Hart | Stu Hart |