The use of lindane (γ-1,2,3,4,5,6-hexachlorocyclohexane) for the protection of stored wheat grain against insects leads to the contamination of milled flour with residues. The fate of lindane residues in wheat flour under normal conditions of bread making was studied with the 14C-labeled compound. About 75 to 82% of the radioactivity in wheat flour was retained by the baked bread and 94% of this was present as lindane. γ-PCCH, 1,2,4-trichlorobenzene and three isomers of tetrachlorobenzene were tentatively identified as degradation products in the bread. In view of the fact that more than 72% of the lindane in flour may be retained by baked bread, the desirability of using lindane for stored grain protection should be re-examined.