ABSTRAK
Setiap negara berdasarkan kedaulatannya memiliki berbagai cara atau dalam hal ini, sistem yang dibentuk untuk melindungi kedaulatan tersebut serta kepentingan nasionalnya, khususnya di laut. Setidaknya dikenal tiga jenis sistem penegakan hukum di laut, yakni sistem Single Agency Multi Tasks, sistem Multi Agency, dan sistem Three Tier Coastal Security. Ketiga sistem tersebut memiliki cirinya masing- masing, yang paling jelas dapat dilihat adalah jumlah instansi yang melakukan fungsi penegakan hukum di laut dan bagaimana penunjukan instansi utama yang melakukan fungsi tersebut. Berdasarkan penelitian yuridis normatif yang telah dilakukan, secara umum negara yang menerapkan sistem Single Agency Multi Task memiliki satu instansi utama penegak hukum di laut, sistem Multi Agency tidak memiliki instansi utama penegak hukum di laut, dan sistem Three Tier Coastal Security sesuai namanya memiliki tiga instansi utama penegak hukum di laut.

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ABSTRACT
Each states, based on their sovereignty, has different ways or in this case, different system formed to protect their sovereignty and national interests, especially at the sea. There are at least three types of maritime law enforcement systems: the Single Agency Multi Tasks system, the Multi Agency system, and the Three Tier Coastal Security system. These three systems have their respective characteristics, which can be identified from the number of agencies with maritime law enforcement functions and the appointment of apex bodieswith said functions. Based on the normative and juridical research that has been done, in general, stateswith the Single Agency Multi Task system has one apex body with maritime law enforcement functions, the Multi Agency systems does not have any apex bodies with said functions, and the Three Tier Coastal Security system, as the name suggests, has three apex bodies with maritime law enforcement functions.