Railgun could refer to:
- Misaka Mikoto, the Level 5 esper of Academy City, nicknamed Railgun.
- Railgun (ability), which is the official name of her Electromaster ability.
- Railgun (special move), which is the signature move used by Misaka Mikoto.
- Railgun, the first episode of Toaru Kagaku no Railgun S.
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