This study aims to determine whether there are differences in Prosocial Behavior in Active and Non-Active Members of Catholic Youth (OMK) In Church X. This study uses a quantitative approach, with data collection techniques using a questionnaire. The measurement tool used Prosocial Scale to measure prosocial scale. The sample of this research is Young Catholics aged 16 - 25 as many as 80 people consisting of 40 active members and 40 non active, with purposive sampling method. Technical analysis using Independent Sample T-Test. The results of data processing show that there is no Prosocial Behavior on Active and Non-Active Members of Catholic Youth (OMK) in Church X