This paper presents a French adaptation of the Metamemory in Adulthood (MIA) instrument. The purpose of the study was to assess the psychometric qualities of the French version and to test its validity by replicating age and sex differences in a large sample of French speaking adults. The MIA was administered to 120 males and 185 females, aged between 18 and 95. The initial factor structure of the MIA was replicated and the eight metamemory dimensions were identified, although there was some overlap between the dimensions. The internal consistency of the scales was assessed by computing Cronbach's alpha coefficients; seven of the eight scales were found to be reliable. The intercorrelations between the dimensions were also examined and revealed that each scale is tapping a specific aspect of metamemory. Finally, the analyses of variance confirmed the existence of significant age differences on five scales of the MIA and sex differences on three dimensions.