This research describes the psychometric properties of a new child self-report measure, the separation anxiety scale for children (SASC), which assesses the frequency of symptoms of separation anxiety in children from 8 to 11. The factor solution with a sample of 1,201 children from 8 to 11, isolated three factors, discomfort from separation, worry about separation, and calm at separation, tested by confirmatory factor analysis, which accounted for 32.80% of the total variance. Results indicated that the SASC has a high internal consistency (alpha = 0.83). The results revealed a high test-retest reliability of the instrument, and a high number of correctly diagnosed cases. The correlation of scores with other anxiety measures shows that the variable most associated with separation anxiety is trait-anxiety.