The purpose of this study was to validate the Index of Active Listening (IAL) as an evidence-based practical measure for assessing active listening. In total, 120 adults participated in the study by filling out the IAL. Then, health and social care professionals assessed participants‘ active listening ability. Results indicated strong significant correlations between professional assessments and the behavioral or semantic differential scores on the IAL. The inter-rater reliability was 0.91. Thus, the IAL was deemed a highly valid and reliable measurement of active listening, making it a helpful tool for evaluating active listening skills in professionals.