SQ

SQ, Sq, or sq may stand for:

Psychology

 * Social intelligence quotient, a statistical abstraction of social intelligence
 * Systemizing quotient, a measure of a person's neurological tendency to systemize

Science and technology

 * SQ (program), a program for compressing files on MS-DOS and CP/M
 * Sound quality, the characteristics of the output of a preamp, amp or sound system
 * Stereo quadraphonic, a matrix quadraphonic gramophone record format developed by CBS

Other

 * Shakespeare Quarterly, a quarterly academic journal on the works of William Shakespeare
 * Albanian language (ISO 639-1 language code sq)
 * Singapore Airlines (IATA airline designator SQ)
 * Space Quest, a series of adventure games by Sierra Entertainment
 * Square, a type of measure of area, such as square foot (sq ft)
 * Block, Inc., financial services company (NYSE stock ticker SQ)
 * Sûreté du Québec, the Quebec police force
 * An organization from the Infinity Ring book series
 * SQ, a short story by Ursula Le Guin
 * Subcutaneous injection, in medicine