DNF is the largest nature conservation and environmental organisation in Denmark. With the support of 140,000 members, DNF works to protect nature and the environment including coastal areas. It has 216 local committees and 2000 active members who are active at local and regional levels.

The David Suzuki Foundation works with government, business and individuals to conserve our environment by providing science-based research, education and policy work, and acting as a catalyst for the change that today's situation demands. The foundation is dedicated to protecting the diversity of nature and inspiring Canadians to act with nature in mind. They advocate for better management and protection of coastal waters to help endangered species and restore biodiversity, sustainable fishing, and protection of marine life .

The Wadden Sea, Europe's largest intertidal wetland, is situated between the mainland of The Netherlands, Germany and Denmark and a string of islands. De Waddenvereniging (The Wadden Sea Society) was established in 1965, has more than 45,000 members, and aims to preserve the characteristic values of the Wadden area for future generations.

An initiative of Dive Friends Bonaire, Debris Free Bonaire encourages local residents and visitors to the Caribbean island of Bonaire to take action and volunteer a small amount of their time to collect plastic marine debris from Bonaire’s east coast. Jan 2023: Debris Free Bonaire website inactive - prefer https://www.divefriendsbonaire.com/eco-activities/

The DSCC was founded to address the issue of bottom trawling on the high seas in the absence of an effective governance regime. The coalition is made up of over 70 non-governmental organisations (NGOs), fishers organisations and law and policy institutes, all committed to protecting the deep sea. The alliance works to promote the conservation of biodiversity on the high seas, and is calling on the United Nations General Assembly to institute a moratorium on high seas bottom trawling in order to protect seamounts, cold-water corals and vulnerable deep-sea ecosystems. DSCC members include local, regional, national and international conservation and environmental organizations.

Deep Sea Guardians is a non-profit environmental organization founded in 2021. Their missions is to use their creative skills and vision in order to create powerful images that will raise awareness and educate people about ocean conservation and all the issues that marine creatures are facing nowadays. This is includes a documentary about shark populations around the world and their important role in marine biodiverse

Defenders of Wildlife is an environmental group with a marine campaign. They employ education, litigation, research, legislation and advocacy to defend wildlife and its habitat. In each program area, an interdisciplinary team of scientists, attorneys, wildlife specialists and educators works to promote multi-faceted solutions to wildlife problems. Note that Friends of the Sea Otter merged with Defenders of Wildlife in 2020.

The Delfini del Ponente APS is a young association of scientists and professionals with a focus on protection of the sea and its creatures, all with an interest in conserving the biodiversity of Western Liguria in Italy. Monitoring cetaceans and other marine wildlife including seabirds in the Western Ligurian Sea is their main activity, largely focused on the bottlenose dolphin, a species that lives in coastal shallow waters. In addition, they present educational activities to cultivate an environmental culture, including internships. They are based in the city of Imperia, positioned in a central area of the “Pelagos Sanctuary”.

The German Foundation for Marine Conservation is a group of committed animal welfare and nature conservation advocates, who fight for the protection of threatened marine animals and the preservation of marine habitats. They support and carry out projects, campaigns, and initiatives aimed at conserving marine life. This includes marine & nature conservation; animal welfare; science and research; and development cooperation. Since 2022 they have had a long term eDNA Project on Fiji-Island to identify habitats of guitarfish species and of young bullsharks. They support projects to protect sharks, rays, sea turtles and marine mammals, restoration of coral reefs and seagrass beds, for sustainable fishing and ocean cleanups. Their educational and awareness-raising work aims at anchoring the importance of marine conservation in people's minds and actions. LinkedIn address: https://de.linkedin.com/company/deutsche-stiftung-meeresschutz

Dilmah Conservation was established with the stated purpose ' to extend the Dilmah philosophy of making business a matter of human service, to include the protection of and sustainable interaction with the environment'. To this end, they are involved in many areas of conservation, including a marine programme which focuses on conserving marine habitats (including 'carrying out species diversity assessments, information sharing and working with relevant local and national institutions to ensure conservation of these habitats') and conserving the endangered Dugong via an information dissemination campaign targeting school children and fisher communities in the North of the country, as well as carrying out surveys and information gathering.

Dive against Debris is an PADI Aware Foundation initiative which encourages all divers to become citizen scientists by removing pollution from the marine environment while diving. PADI offers a speciality course on the subject. The website provides an interesting map for tracking debris, and various toolkits.

Richard (Ric) O'Barry, who founded the Dolphin Project in 1982, worked both within the dolphin captivity industry, and against it. Ric O'Barry had trained five dolphins that were used in the TV series called Flipper; however, O'Barry changed from training to advocating against the captivity of dolphins after one of the Flipper dolphins died in his arms. O'Barry campaigns against Japan's cruel cetacean hunts and also for halting the Solomon Islands dolphin trade. He has also rescued and rehabilitated dolphins in many countries around the world.