Scd
Scd or SCD may refer to:

In medicine
Salicylate decarboxylase, an enzyme
Schnyder crystalline corneal dystrophy, an eye disease
Sequential compression device, to improve blood flow
Sickle-cell disease, a blood disease
Specific Carbohydrate Diet
Stearoyl-CoA desaturase-1, an enzyme
Sudden cardiac death
Superior canal dehiscence, of the inner ear

In engineering and information technology
System context diagram
/dev/scd, SCSI audio-oriented optical disk drives
Slowly changing dimension, a datawarehousing term for data that changes slowly
The Scientific Computing Division of the National Center for Atmospheric Research
Substation Configuration Description for electrical substations
Special category data, sensitive data as defined by the GDPR

Other uses
Satélite de Coleta de Dados, Brazilian satellites SCD-1 and SCD-2
Sc.D., Doctor of Science degree
Scottish country dance
Senior College Dún Laoghaire, now Blackrock Further Education Institute, Ireland
Social communication disorder, a language disorder
Specialist Crime Directorate (Metropolitan Police), London, former branch
Sports Collectors Digest, a publication
St. Cloud station, Minnesota, U.S., Amtrak code
Strictly Come Dancing, a British TV show
Sylacauga Municipal Airport, Alabama, US, FAA identifier
Syrian Civil Defense or the White Helmets,  a volunteer organisation