Objectives <p>Scientific interest in compassion has increased in recent years. However, research highlights issues related to the measurement of compassion in children and young people (CYP). This systematic review&#xa0;aimed to describe and critically appraise measures of self- and other-compassion developed and/or validated with CYP.</p> Method <p>Medline, PsycInfo and Web of Science were searched from inception to 31 st July 2024 to identify English language, peer-reviewed psychometric papers on the development or validation of compassion measures for use with CYP. The measures were critically reviewed and rated for quality.</p> Results <p>Nineteen articles were included that outlined psychometric properties of eight compassion measures: Compassionate Engagement and Actions Scales—Adolescence (CEAS-A); Compassion Scale – Adolescence (CS-A); Compassion Scale—Child (CS-C); Self-Compassion Scale (SCS); Self-Compassion Scale – Child (SCS-C); Self-Compassion Scale—Youth (SCS-Y); Self-Compassionate Reactions Scale – Child (SCRS-C); Shortened Self-Compassion Scale—Adolescence (S-SCS-A). Quality ratings ranged from 2 to 9 out of 14. The CEAS-A received the highest rating (9), followed by the SCS-Y (8), SCS (7) and CS-C (7). No measure captured all five compassion elements and evidence for test–retest reliability and floor and ceiling effects was largely absent. Most papers assessed self-compassion and used (translated, adapted versions of) the SCS and SCS-Y.</p> Conclusions <p>This review suggests there are no psychometrically robust measures that comprehensively assess self- and other- compassion in CYP, potentially impeding research. The psychometric quality of existing compassion measures for CYP should be improved, and/or a new measure should be developed, and include the measurement of compassion for others.</p> Preregistration <p>This study is not preregistered.</p>