The Lewis Pugh Foundation (LPF) works for the preservation and conservation of our oceans. Founder Lewis Pugh is an ocean advocate and a renowned endurance swimmer who, via his remarkable initiatives in challenging conditions, shines a spotlight on the plight of the oceans. He is a UN Patron of the Oceans and currently promoting the creation of marine protected areas around Antarctica. His foundation promotes, for the benefit of the public, the conservation, protection and improvement of the physical and ecological environment, particularly the marine environment. LPF also provides education and disseminates information about the marine environment and the importance of its conservation.

LPN was founded in 1948, the oldest environmental NGO of the Iberian Peninsula. In its more than 73 years of existence, LPN has been distinguished with many international awards and some of the nation's most prestigious honors. Their approach to conservation places a priority on sustainable development, including quality of life of present and future human generations. Some of its major projects include the protection of endangered species such as the Iberian lynx, the cinereous vulture, and the stepparian birds of Alentejo, among others. The conservation of marine life and associated marine ecosystems are also a priority for action. Their Circular Seas project - Mares Circulares – launched in 2018, is a global project which encourages the circular economy, environmental awareness and training for waste management and the promotion of active citizenship at the level of volunteering. It aims to contribute to a change of mentality by promoting the creation of environmentally sustainable solutions to the problem of marine litter, in a society made up of more informed and responsible citizens with an understanding of that circularity.

Living Oceans Society focuses its work on six initiatives: salmon farming, ocean acidification, sustainable seafood, ocean ecosystems, tankers and ocean planning

Loggerhead Marinelife Center, located in Loggerhead Park, Juno Beach, Florida, is a sea turtle research, rehabilitation, education and conservation center. The center also manages the Juno Beach fishing pier.

The MARLISCO project aimed at raising public awareness, facilitating dialogue and promoting co-responsibility among the different actors towards a joint vision for the sustainable management of marine litter across all European seas. It involved the four European Regional Seas: North-East Atlantic, Baltic, Mediterranean and Black Sea, by a consortium with members located in 15 coastal countries. Project duration 2012 - 2105

MCS in Scotland is just as it says, the Scottish arm of the UK's Marine Conservation Society. They focus on marine conservation and fisheries management. MCS Scotland leads the Save Scottish Seas coalition to influence the Scottish Government and Scottish Parliament on all matters marine. This includes influencing policy and the law (Marine (Scotland) Act, and a fisheries strategy), creating 36 new MPAs including the largest in Europe, implementing a National Marine Plan, gaining protection for the most vulnerable inshore MPAs from fishing, influencing policy on plastic and other pollution.

Part of the municipal initiative to keep the sea and beaches clean, the Ecolmarine team, with 14 boats, remove scum from surface and remove solid items

Marevivo is a significant Italian environmental association that protects the sea and its resources, focusing in particular on biodiversity conservation, sustainable development, enhancement and promotion of marine protected areas, combatting pollution and illegal fishing. They promote education in schools and universities, and act as an advocate influencing law and policy with many successful campaigns in Italy, such as recently the ban of microplastics in rinse-off cosmetics and the ban on sea cucumber fishing. Marevivo relies on the work of hundreds of volunteers and thousands of members scattered all over Italy, with representation throughout the country in the form of delegations in more than 25 centres. They are organised into diving, sailing, canoe & kayak, beaches and shore divisions.

The Marine Cleanup Initiative was founded by volunteer scuba divers who collect waste from the ocean. They are active in Florida.

Marine Conservation Institute is a non-profit scientific and conservation advocacy organization that has been working since 1996 to promote cooperation essential to protecting and restoring the Earth's biological diversity. From the headquarters in Seattle WA and the Washington DC and California offices, they work to protect marine life around the United States and beyond by encouraging research and training in marine conservation biology, bringing scientists together to examine crucial marine conservation issues, conducting policy research to frame the marine conservation agenda, leading outreach efforts to educate scientists, the public and decision makers on key issues, and building partnerships to solve problems affecting marine life and people.

MCP is dedicated to preserving and protecting coastal resources in the Philippines through education, volunteerism and research. They work to preserve fragile marine habitats like coral reefs and mangrove forests, with an additional aim of improving the quality of life for marginalised fisherfolk in the central Philippines. A volunteer based organisation, international volunteers can join a large professional team of marine biologists, scientists, teachers and dive instructors. Participation in the program involves extensive scuba diving activities, with training offered on site. ‘Since becoming operational in 2015, MCP has led mangrove replantation efforts, and have removed tons of marine debris and ghost nets. Volunteer divers have placed sinkers and buoys in many marine protected areas, improving demarcation and local conservation efforts, whilst volunteers have taught numerous school classes in the municipality about marine issues.’ Their YouTube channel is https://www.youtube.com/c/MarineConservationPhilippines Amongst several others, check out their video about conservation volunteering at https://www.youtube.com/watch?v=qA6hggVddfs

The Marine Conservation Society, based in the UK, organises multifaceted marine conservation projects, including Beachwatch and the Great British Beach Clean weekend annually in September. Plastic pollution is one of several focuses. Their Seasearch project involves volunteers collecting information about marine habitats, plants and animals underwater, thus engaging divers and snorkellers in marine-life monitoring research. The MCS is an active advocate, promoting marine protected areas as a policy with the aim of 30% of UK waters having protected status by 2030.