SQL (disambiguation)
SQL (short for Structured Query Language) is a domain-specific language used in programming and designed for managing data held in a relational databases. SQL may also refer to:
 Standard quantum limit, a limit on measurement accuracy at quantum scales in physics
 Squelch, in telecommunications, a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal
 San Carlos Airport (California), an airport in San Mateo County, California, whose IATA designation and FAA LID are SQL