- North Pole Area
- North Wind
- Notor Banger
- NovaMan.EXE (Darkloid)
- Nova Strike
- Novas Aventuras de Megaman
- Nuclear Detonator
- Null
- Number
- NumberMan.EXE
- NumberMan.EXE (anime)
- Number 1 Curry
- Number Soul
- Nutty
- Nástenka
- OOPArt
- OVER-1
- Oath of the Tomahawk
- Obiiru
- Ocean Bottom SOS
- Ocean Stage
- Ocean Tower
- Oceanic Highway Ruins
- Octo Ninja
- Octobulb
- Octon
- Octone
- Octoper OA
- Official Center
- Official NetBattler
- Oil
- Oil Field
- Oil Field (Mega Man 6)
- Oil Field (Mega Man ZX Advent)
- Oil Man
- Oil Man/Archie Comics
- Oil Man (DOS)
- Oil Slider
- Oil Stream
- Okosutobon
- Okuden Valley
- Old Castle Stage
- Old Castle Stage (Mega Man 10)
- Old Castle Stage (Mega Man 7)
- Old Doll
- Old Residential Area
- Old Robot
- Old School
- Old Stove
- Old Surface City
- Omega
- Omega-Xis
- Omega-Xis Copy
- Omi Minami
- Omoide wa Okkusenman!
- One More Chance
- One More Time
- Oni Robo
- Onibi Island
- Onimusha Blade Warriors
- Opening
- Opening Stage
- Operation Battle
- Operation Ragnarok
- Operation Righteous Strike
- Operator
- Operator (Mega Man Battle Network)
- Ophiuca
- Ophiuca Noise
- Opponent Noise
- Opposites Attract
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