Xã hội đen, (chữ Nôm: 社會顛, literally means "black societies"), is a Vietnamese term used to describe criminal underworld. The term is believed to have become widely used thanks to Hong Kong TV series and movies about the Chinese secret society of Heishehui (Chinese: 黑社会). An individual who participates in these criminal activities can be called a giang hồ, găng-xtơ, côn đồ, or tội phạm; while a criminal organization is known as băng đảng or băng nhóm, depending on its scale. They are those whose goal is to make money from illegal and overall immoral activities.

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