This article examines collective legal mobilization through the courts, or collective litigation, in a non‐liberal regime. It analyses the emergence and development of collective litigation to challenge the constitutionality of section 377A of the Penal Code, the law that criminalizes same‐sex sexual conduct in Singapore. The analysis focuses on the relational dynamics of collective litigation and legal subjectivities of the social actors involved, highlighting how social positions and strategic interests shaped their interactions and decisions on litigation. While gay rights activists emphasized their movement's collective interests when choosing the appropriate case and lawyers, a movement outsider pursued individual interests on behalf of a client. Due to their divergent social positions and strategic interests, the two teams competed with each other as they initiated two separate constitutional challenges. Tension between the teams led to conflict with constituents of the gay rights movement and influenced their relational dynamics with other parties.