Gejang (Korean: 게장) or gejeot (게젓) is a variety of jeotgal, or salted fermented seafood in Korean cuisine, which is made by marinating fresh raw crabs in either ganjang or a chili pepper powder based sauce. The term consists of the two words; ge, meaning "a crab", and jang which means "condiment" in Korean. The crabs selected for the Gejang dish are mainly female crabs with eggs. While gejang was originally used to refer to crabs marinated in soy sauce, it is now also called ganjang-gejang (Korean: 간장게장) to differentiate it from yangnyeom-gejang (양념게장). The latter is a relatively new dish that emerged alongside the boom in South Korea's restaurant industry. Its origins appear to come from the Chungcheong and Jeolla provinces, which both have long-standing traditions of mixing raw fish or dried pollock with a spicy red pepper flake or gochujang sauce. People later began preparing crab in a similar fashion, resulting in what is known today as yangnyeom-gejang. "Yangnyeom" means "seasoning" or "seasoned" in Korean, and refers to the spicy sauce of the dish that is made with chili pepper powder.

Jeotgal (Korean: 젓갈) or jeot (젓), translated as salted seafood, is a category of salted preserved dishes made with seafood such as shrimps, oysters, clams, fish, and roe. Depending on the ingredients, jeotgal can range from flabby, solid pieces to clear, broth-like liquid.