Mega or MEGA may refer to:
- mega-, a metric prefix denoting 106
- Mega (number), a certain very large integer in Steinhaus–Moser notation
- "mega-" a prefix meaning "large" that is used in taxonomy
- Gravity assist, for Moon-Earth gravity assist and Mars-Earth gravity assist
- Aixam-Mega, a French automobile manufacturer based in Aix-les-Bains, Savoie
- Megaupload, a file sharing site seized by the FBI
- Mega (service), a cloud storage and file hosting service
- Mega Aircompany, a charter airline based in Almaty, Kazakhstan
- Mega Enterprise, a South Korean company that specialises in developing games
- MEGA International Srl., a French software company
- Mega Maldives, a Maldivian airline
- MEGA, a Russian chain of supermarkets, until september 2023 owned by IKEA
- MEGA (radio station), a Belarusian Internet radio station
- KLOL (Mega 101), a Spanish radio station in Houston
- KXOL-FM (Mega 96.3), a Spanish radio station in Los Angeles
- WSKQ-FM (Mega 97.9), a Spanish radio station in New York City
- WMEG (Mega 106.9), a Spanish radio station in Puerto Rico
- Mega (magazine), a defunct British video game magazine
- Mega, a character from The Tribe
- Mega Millions, a major jackpot game in the U.S.
- MEGA Family Shopping Centre, a network of shopping malls in Russia operated by IKEA
- MEGA Esports, a professional esports organization based in Bangkok, Thailand
- Marx-Engels-Gesamtausgabe, the complete works of Marx and Engels in German
- Metro-Link Express for Gandhinagar and Ahmedabad
- Mega Society, a high IQ society
- Megatall, a skyscraper taller than 600 m (1,969 ft)
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