- The squid is a cephalopod, a type of marine mollusc.
- Squid is also the name of a popular open source Web proxy cache.
- SQUID (Superconducting Quantum Interference Device) is loop of superconductors that contains one or more Josephson junctions.
- Squid is also a derogatory term referring to a motorcyclist, typically on a sportbike, that rides with minimum of safety gear, no rider training and poor skill while attempting to ride faster than their ability allows. The more experienced often perform dangerous stunts that, when performed on public roads, endanger themselves and other motorists. There is currently an entire culture devoted to it in which money is made selling videos of their stunts and performing at shows on closed race tracks. The term is derived from the 1960's when Navy Sailors would dock in San Diego, they would purchase two-stroke motorcycles (which would in those days spew black smoke if misoperated) and ride them around under the influence of alcohol.
- "Squid" is also the nickname for one of the characters on the "Rocket Power" cartoon show.
- "Squid" is also New England undergraduate slang for "study". It appears to have originated in the early 1970s, and originally came from the fact that squids squirt ink. It is used by many to refer to people who are smart or those who study a lot.
- Squid was an Allied anti-submarine weapon used during the Second World War.
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