Maritime liens, without a doubt, are a unique and hugely important feature of maritime law. Broadly speaking, they represent a claim on or special right to a vessel. However, there is no uniformity when it comes to studying this unique feature. It is from the Anglo-Saxon jurisdictions that we get the majority of our information about its nature and associated problems. In this article, the law on maritime liens is examined through a comparative study of several Anglo-Saxon jurisdictions and Mexican law. Also under investigation are the problems that arise when a national court is faced with a maritime lien created under foreign law, and when that maritime lien differs from those liens established under the law that governs the domestic court.