Singleness emerges as a theme in studies on contemporary relationships across societies, including in Indonesia. While in most Western societies, singleness reflects an individual’s personal preference, marriage is viewed as cultural imperative in Indonesia, and being single is often held involuntarily by most never-married adults. This study outlines the reasons of why Indonesian individuals remain involuntarily single. The interviews of 40 never-married adults aged 27–52 years ( M age = 33.14; SD = 4.04) revealed that gender and religious differences regarding marriage expectation are central themes in understanding involuntary singleness. The study particularly revealed four gender-specific reasons for why individuals remained involuntarily single: obtaining a career, having an incompatible marriage expectation, having dependent family members, and having temporal perspectives of singleness. Two themes emerged regarding the religious perspective of singleness: religious interpretations about singleness and religion-related coping ways of being involuntarily single. The themes suggest that marriage is not a mere personal fulfillment as cultural and religious values determine individuals’ marriage feasibility. While offering a new perspective of involuntary singleness from non-Western perspective, the results inform strategies to cope with unwanted singleness, particularly in the marriage- and religion-preoccupied societies.