SQ
SQ may stand for:
- Albanian language (ISO 639 alpha-2)
- Squadron
- Square (algebra), especially measures of area, such as square foot (sq ft)
- The IATA airline designator for Singapore Airlines
- Sentience Quotient a term to measure the total processing capacity of a brain
- Sound Quality the characteristics of the output of a preamp, amp or sound system.
- Space Quest, a series of adventure games by Sierra.
- Spiritual Quotient, a term in popular psychology
- United States Academic Decathlon has an event called Super Quiz
- Subcutaneous tissue injection abbreviation
- Sûreté du Québec, the Quebec police force
- , which has something to do with Tate-II SQ Decoders, upon which Dolby_Pro_Logic (DPLII) was based
- Quadraphonic matrix system from Columbia Records', used in the 1970s
- The SQ program for compressing files on MS-DOS and CP/M.
- The a cappella musical group at Tufts University.