Competitive recreational sport lies between informal physical activity and highly structured competition. Participants may join such groups for enjoyment, social interaction, personal development, physical activity, and achievement, yet continued participation may become difficult when group experiences threaten important aspects of social identity. This paper examines the conceptual relationship between social identity threat and withdrawal intentions in competitive recreational groups. The framework draws primarily on social identity theory and self-categorization perspectives, while also considering group identification, perceived acceptance, status evaluation, interpersonal treatment, social belonging, and perceived support. Existing sport psychology research indicates that group identification is relevant to behavioural engagement, social support, stress appraisal, leadership, and sport-related identity across both recreational and competitive settings. Because no original participant dataset was supplied, the manuscript adopts a simulation-based conceptual design. Illustrative withdrawal-intention scores of 2.18, 3.47, and 4.52 represent low, moderate, and high social identity threat, respectively. A second simulated analysis assigns contribution indicators of 52% to social identity threat, 44% to group belonging, and 37% to perceived group support. These values are conceptual illustrations rather than empirical estimates. The analysis proposes that identity threat may increase withdrawal intentions when participants feel devalued, insecure in their group position, insufficiently recognized, or socially disconnected. However, identity threat does not necessarily produce withdrawal, because participants may seek recognition, reinterpret negative experiences, strengthen group identification, or rely on alternative social identities. Future research should distinguish identity threat from general dissatisfaction and examine how leadership, peer relationships, status perceptions, and group support influence withdrawal over time.