The maritime domain is increasingly a priority for NATO as the alliance seeks to bolster its defense and deterrence posture in Europe’s north and east. Much work remains to be done in terms of NATO’s maritime posture and the maritime capabilities and capacities of its members. The maritime domain presents a unique challenge for NATO’s Baltic members, as they are frontline states in the new contest between NATO and a revanchist Russia. This issue brief lays out the particular challenges for the Baltic States in the maritime domain in the Baltic Sea region, and how Estonia, Latvia, and Lithuanian can build more effective maritime defense in concert with NATO and the United States.