This research aims to analyze the implementation of immigration enforcement by immigration authorities against foreign nationals who misuse their visas and to evaluate the constraints and efforts needed to enhance the effectiveness of immigration enforcement in addressing stay permit violations. This study is an empirical legal research employing statutory, conceptual, and socio-legal approaches. The findings indicate that law enforcement against the misuse of the Visa on Arrival (VoA) generally falls into two categories: immigration administrative measures and Pro Justicia (criminal proceedings). The Mataram Class I Immigration Office faces several constraints in addressing foreigners who enter Indonesian territory by abusing visit permits, categorized into three factors: 1) Substance factors, 2) Structural factors, and 3) Cultural factors. To mitigate such violations, the Mataram Class I Immigration Office has implemented several strategic measures: 1) Conducting direct field surveillance to monitor the presence of foreigners; 2) Participating in Regional Intelligence Community (KOMINDA) activities; 3) Implementing socialization programs for both the public and foreign nationals; 4) Performing administrative supervision; 5) Increasing staff numbers through merit-based recruitment systems; and 6) Executing administrative legal actions.