Neutron is a medium-lift two-stage launch vehicle under development by Rocket Lab. The vehicle is being designed to be capable of delivering an 8,000 kg (17,600 lb) payload to low Earth orbit in a reusable configuration, and will focus on the growing megaconstellation satellite delivery market. The vehicle is expected to be operational sometime in 2024. It uses LOX and liquid methane propellant on both stages of the vehicle.

On 28 February 2022, Rocket Lab announced that Neutron will launch from the Mid-Atlantic Regional Spaceport (MARS) within NASA's Wallops Flight Facility on the eastern coast of Virginia. It was also announced that the company will build a 250,000 square feet manufacturing and operations facility adjacent to the Wallops Flight Facility. Ground was broken for this facility on 11 April 2022. As of December 2021, Rocket Lab is planning for the first launch to take place no earlier than 2024.

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