SUMMARYAntireticulin antibody was present in 17% of sera from thirty‐five patients with dermatitis herpetiformis, 45% from twenty‐eight patients with adult coeliac disease and none of thirty healthy controls.There was a higher incidence of antireticulin antibody (a) in patients on normal diets than in those on gluten free diets, and (b) in patients with subtotal villous atrophy than in those with partial villous atrophy. Two patterns of tissue staining were demonstrated, one of which was almost invariably associated with jejunal subtotal villous atrophy. The Ig class of the antibody was IgG in all instances but in 64% antibody of the IgA class was also pres