In this paper, author discussed the overview of circular economy with reference to maritime sector including shipping, ports, and offshore activities, has a significant impact on the environment due to its energy consumption, emissions, and waste generation. Circular economy approach is not well-established in the maritime industry, which currently lags behind different transport modes. Applying the principles of the circular economy in the maritime sector can help mitigate these environmental impacts and promote sustainability. In this paper, application of circular economy in maritime sector and growth strategies was discussed. Furthermore, the use of latest tools like AI, ML for improving the productivity was also discussed by author also gave insight into sustainable marine operation through optimum use of resources, effective sharing of maritime resources, recycle, and reuse in maritime sector. Various new opportunities in the latest era were also discussed by the author.