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The gas-liquid chromatographic determination of endosulfan technical and formulations was collaboratively studied with 11 laboratories. Fifteen samples were dissolved in toluene with di-(2-ethyl-hexyl)phthalate as the internal standard, chromatographed on a column of 10% OV-210, and detected by thermal conductivity. The average coefficients of variation were 0.55% for the 5 technical samples, 0.60% for the 5 wettable powders, and 0.68% for the 5 emulsifiable concentrates. The method has been adopted official first action.