Neutron could refer to:
- Neutron, A subatomic particle.
- Neutron, A Marvel Comics character; member of the Shi'ar Imperial Guard.
- Neutron, A Marvel Comics character; member of the Micronauts race.
- Neutron, A DC Comics character; Real name: Nathaniel Tryon; foe of Superman.
- Neutron, Pre-Crisis Earth-One version of Neutron.
- Neutron, Version of Neutron from the DC Animated Universe.
- Neutron, Version of Neutron from the Smallville television series.
- Neutron, Version of Neutron from the Young Justice animated series.