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Booster, a character in the animated television series and the pilot episode film Buzz Lightyear of Star Command: The Adventure Begins and Buzz Lightyear of Star Command
Booster, the Japanese name for the Pokémon Flareon
Booster, a character in the video game Super Mario RPG

Booster (newspaper), a Chicago newspaper
Booster pack, a packaged set of collectable game cards or figurines that supplements the starter packs

Booster (electric power), a motor-generator set used for voltage regulation in direct current electrical power circuits
Booster (rocketry), used in space flight to provide or augment the main thrust in the initial phase of the rocket's flight
Booster, a co-channel repeater in broadcasting, used to improve signal strength
Booster, technically an alternative term for an electronic power amplifier, but with slightly different meaning depending on the technical field in which it is used
Booster dose, or booster shot, in medicine, a vaccination given after a previous vaccination
Booster engine, extra cylinders on a steam locomotive, driving the trailing truck or a tender truck, to give more power on starting
Booster pump, a type of compressor
Explosive booster, a bridge between a low energy explosive and a low sensitivity explosive
Launch vehicle, a satellite-launching rocket, sometimes informally referred to as a booster
Pegasus Booster, a powered hang glider
Vacuum servo or brake booster, a component in car braking systems

Booster, someone who is a member of a booster club
Booster, someone who engages in boosterism
Booster, someone who engages in theft, specifically to resell robbed goods
Booster seat, a type of child car seat designed to properly position the vehicle's seat belt
Faxe Kondi Booster and Booster Blue, Danish energy drinks