The aim of the study was to evaluate the potential association between ambulatory blood pressure and the molecular variants T174M and M235T of the angiotensinogen gene in a random sample of young normotensive men (n = 145). The two point mutations were detected using restriction digests of a mispairing polymerase chain reaction product. Twenty-four-hour ambulatory blood pressure monitoring was performed with a SpaceLabs 90207 device. Ambulatory blood pressure levels did not vary according to T174M and M235T genotypes. When the subjects were grouped according to their blood pressure level (as indicated by tertiles of their 24-h ambulatory blood pressure), no significant differences in allele frequencies between the three groups were found. Our results indicate that the T174M and M235T molecular variants of the angiotensinogen gene have no major influence on ambulatory blood pressure in young normotensive subjects.