Marine collagens have gained importance since collagen from mammalian sources has religious constraints and complications involving outbreaks of bovine spongiform encephalopathy and foot and mouth disease. Fish skin, bone, and scales have been the main sources of marine collagen. Recently, non-traditional sources such as starfish, jellyfish, sea urchins, and sea cucumbers have also been used to extract collagen. The conventional method for collagen extraction is tedious and demands considerable amounts of chemicals and extraction time. Sustainable collagen extraction with novel technologies has been looked upon, targeting more resource efficiency. The application of these novel technologies reduces the substantial quantities of chemicals used in collagen extraction in addition to reducing the extraction time without jeopardizing the collagen yield and functionality. In this chapter, we have dealt with information about non-traditional sources of collagen, especially aquatic ones, and broadly explained the novel technologies applied for the sustainable production of collagen from these sources and the effects of these technologies on collagen structure and functionality.