Residue levels of the chlorinated hydrocarbons p,p'‐DDT (2,2‐bis(p‐chlorophenyl)‐1,1,1‐trichloroethane), p,p'‐DDE (2,2‐bis(p‐chlorophenyl)‐1,1 ‐dichloraethane), hexa‐chlorobenzene (HCB), α‐, β‐, and y‐hexachlorocyclohexane (HCH), aldrin, dieldrin, and polychlorinated biphenyls (PCBs) were determined in human milk of Kenyan mothers living in different areas of Kenya. The main organochlorine contaminants found in all the milk samples analyzed were p,p'‐DDT and p,p'‐DDE. Great regional differences were found, and mean levels of sum DDT and DDT/DDE ratio ranged from 1.1 to 18.7 mglkg milk fat and from 0.7 to 5.7, respectively.