Booster may refer to:
In science and technology:
- Booster (electric power), a motor-generator set used for voltage regulation in direct current electrical power circuits
- Booster dose, or booster shot, in medicine, a vaccination given after a previous vaccination
- Booster pump, a type of compressor
- Booster (rocketry), used in space flight to provide or augment the main thrust in the initial phase of the rocket's flight
- Launch vehicle, a satellite-launching rocket, sometimes informally referred to as a booster
- Booster engine, extra cylinders on a steam locomotive, driving the trailing truck or a tender truck, to give more power on starting
- Explosive booster, a bridge between a low energy explosive and a low sensitivity explosive
- A co-channel repeater in broadcasting, used to improve signal strength
- Vacuum servo or brake booster, a component in car braking systems
- Pegasus Booster, a powered hang glider
In amusement park rides:
- Booster (Fabbri ride), a pendulum ride manufactured by Fabbri
- Booster (HUSS ride), a ride similar to Breakdance manufactured by HUSS Maschinenfabrik
- Booster (KMG ride), a pendulum ride manufactured by KMG
In other uses:
- Booster (movie character), a character in the animated television series Buzz Lightyear of Star Command
- Booster (newspaper), a Chicago newspaper
- Someone who engages in boosterism or is a member of a booster club
- Someone who engages in shoplifting
- Booster pack, a packaged set of collectable game cards or figurines that supplements the starter packs
- Booster seat, a type of child car seat designed to properly position the vehicle's seat belt
- A character in the video game Super Mario RPG: Legend of the Seven Stars
- Booster, the Japanese name for the Pokémon Flareon
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