The etching of iron whiskers in picral and nital etchants has been studied and etch‐pit configurations in certain areas of as‐grown whiskers have been observed. Dislocations introduced by plastic deformation of the whisker have been investigated and arrays of dislocations produced by annealing the deformed whiskers have been studied. Whiskers with axes in [100], [110], and [111] directions have been used in these experiments.