GC1 or GC-1 may refer to:
Aircraft Cessna GC-1 Globe Swift (GC-1/1A/1B)
Minor planets 8204 Takabatake (1994 GC1) 9749 Van den Eijnde (1989 GC1) (10133) 1993 GC1 (10328) 1991 GC1 29869 Chiarabarbara (1999 GC1)
Other Sobetirome (GC-1), a thyromimetic drug GC-1 (GigaCluster), a transputer system produced by Parsytec GC-1, an operating division of the Metro Local bus system in Los Angeles, USA Autopista GC-1, a motorway in Gran Canaria, Spain (Combat Group No.1), a unit in the Free French Flight known as "Jam"