A sensitive method for the determination of residual methyl bromide in fumigated foodstuffs is described. Methyl bromide in extracts was converted stoicheiometrically into methyl iodide by reaction with sodium iodide and analysed using gas-liquid chromatography with electron-capture detection. Residual methyl bromide was readily detected at the 10 µg kg^–1 level in a variety of foodstuffs.