•
Galapagos Conservation Trust, a British charity •
Geometric complexity theory •
German Colonial Tovar dialect of German, spoken in Venezuela •
Global Champions Tour, a show jumping series •
Gloucester County Times, a daily newspaper in New Jersey •
Government College of Technology (disambiguation) •
Grand Chess Tour, an annual circuit of chess tournaments •
Grande Cadence de Tir (GCT) 155mm, French self-propelled artillery vehicle •
Green Card Test, used by the United States Internal Revenue Service • Green Crescent Trust, in Sindh, Pakistan •
Greene County Tech School District, in Greene County, Arkansas, United States •
Greenwich Civil Time, an obsolete term for what is now known as Greenwich Mean Time •
Greenwood Community Theatre, in South Carolina, United States • GCT, a codon for the amino acid
Alanine