GC Biopharma [Green Cross Corporation] (KRX: 006280) is a biopharmaceutical company headquartered in Yongin, South Korea.

GC Biopharma specializes in the development and commercialization of vaccines, protein therapies, and therapeutic antibodies for use in the fields of oncology and infectious disease.

GC Biopharma was established as "Sudo Microorganism Medical Supplies Co." in 1967, and changed the name to "Green Cross" in 1971.

The company is engaged in research, development, manufacturing and sales of biotherapeutics, including plasma proteins, recombinant antibodies, and vaccines.

As part of GC Biopharma's global strategies, there are three operations based in the overseas as of 2016.