SQ
SQ is an abbreviation for:
- Schützmeister & Quendt , German porcelain and doll manufacturer
- Semi Quarter, narrow chamber for narrow-shouldered horses, see riding saddle #Westernsattel
- Singapore Airlines (IATA code)
- Sum of squares , see sum of squares of deviations
sq is an abbreviation for:
- Albanian language ( Shqip ), language code according to ISO 639-1
- Squamosum, a skull bone, see scale bone
