Meg may refer to:
- An informal abbreviation for the SI unit megabyte
- An informal abbreviation for the SI unit megohm
- An informal abbreviation for the extinct megalodon shark
- Meg: A Novel of Deep Terror, a novel featuring a megalodon
- Meg!, a comic strip
- Meg (Mag), a short form of the female name Margaret
- Meg, a short form of the female name Meghan is a name that was one of the most popular female baby names in the 1990s.
- Malange Airport (airport code: MEG), an airport in Angola
- Meg Griffin, one of the main characters on the hit TV show Family Guy, voiced by Lacey Chabert, followed by Mila Kunis
- Meg Frampton, guitarist and back-up singer for the band Meg & Dia
MEG may stand for:
- Magnetoencephalography, a neuroimaging technique to measure the magnetic fields produced by electrical activity in the brain
- Monoethylene glycol, a chemical compound widely used as an automotive antifreeze
- Motionless Electrical Generator, a purported perpetual motion machine
- Maghreb-Europe Gas Pipeline
- Multiple exciton generation
