The present study was designed to test whether social competence and mood were predictive of the performance by adults with mild or moderate intellectual disability on a matching-to-sample task using facially expressed emotions as stimuli. Thirty-eight subjects were assigned to either a depressed mood group or a non-depressed mood group based on their scores on the two depression sub-scales of the Reiss Screen for Maladaptive Behavior. The groups were matched on sex, age and level of intellectual disability. Each group consisted of 10 women and nine men; 12 participants in each group had mild and seven had moderate intellectual disability, respectively. Social competence was assessed with the Social Performance Survey Schedule (SPSS). Performance on the matching-to-sample task correlated positively with the subjects' level of intellectual disability, their mood scores and the scores on the Appropriate Skills sub-scale of the SPSS. The implications of these findings for social skills training programmes and limitations of this study are discussed.