Marlo Stanfield is a fictional character on the HBO television drama The Wire, played by actor Jamie Hector. Stanfield is a young, ambitious, intelligent and ruthless gangster and head of the eponymous Stanfield Organization in the Baltimore drug trade. Marlo's organization starts out small-time, competing with the larger Barksdale Organization, but becomes a major player in the Baltimore drug trade fairly quickly.

A repeated theme in Marlo's characterization is his demand for unconditional respect, which supersedes all other concerns. He frequently orders the deaths of those who disrespect him or undermine his name on the streets, and is the most ruthless and violent of the drug kingpins portrayed in The Wire.