This report describes the feasibility and psychometric properties of the child version of the Separation Anxiety Daily Diary (SADD-C) in 125 children (ages 7-14 years) from German-speaking areas of Switzerland. Children with separation anxiety disorder (SAD; n = 58), "other" anxiety disorders (n = 36), and healthy controls (n = 31) recorded the frequency of parent-child separations, along with associated anxiety, thoughts, reactions and subsequent parental responses. Compliance rates were modest, consistent with past research on self-report diaries with anxious children. The SADD-C was better at discriminating children with SAD from controls than "other anxious" children. The SADD-C demonstrated good convergent validity with maternal and child self-reported anxiety (Revised Child Manifest Anxiety Scale, Separation Anxiety Inventory) and perceived quality of life (Inventory for Quality of Life in Children and Adolescents). Results provide support for the SADD-C as an acceptable and valid method of assessing child symptoms and parent behavior on separation. Findings are discussed with regard to the clinical utility of the SADD-C and strategies to improve compliance.