Advanced polymer composites (APCs) are becoming increasingly popular in marine environments because they possess better mechanical qualities, are resistant to corrosion, and are lightweight. Compared to conventional materials such as steel and wood, advanced polymer composites (APCs) provide several important advantages. These composites are made up of high-performance polymer reinforced with natural or synthetic fibers. This study investigates the diverse applications of APCs in marine sectors, including boat and shipbuilding, offshore structures, underwater equipment, and maintenance systems. Their application in shipbuilding, where they are used in hulls and decks, improves fuel efficiency and reduces the weight of the structure. Wind turbine blades, floating platforms, and subsea pipelines are all examples of offshore infrastructure that can benefit from the increased endurance and performance that APCs provide. Underwater systems, such as remotely operated vehicles (ROVs) and sensors, benefit from their capacity to provide mechanical durability and long-term stability. The ability to recycle, the utilization of biodegradable polymers, and the reduction in emissions throughout the lifecycle are some of the environmental benefits that position APCs as sustainable solutions in the field of marine engineering. Even if these advantages are present, there are still obstacles to overcome in terms of recycling, the longevity of natural fibers, and the high production costs. In order to improve both performance and sustainability, future developments will concentrate on biodegradable composites, nanotechnology, and automated manufacturing techniques. APCs, in general, have the potential to change marine sectors by providing material solutions that are efficient, long-lasting, and kind to the environment while also being environmentally friendly.