CONANP currently manages 173 natural areas under federal management, including marine protected areas.

With over 15 years of experience in marine research, education and outreach and six years on the island of Eleuthera, CORE is involved in community education and capacity building in north Eleuthera. Their mission is to involve Bahamian students and communities in the research process which is aimed at understanding of ecologically sensitive habitats that ultimately promotes the conservation of biodiversity. Their education programs promote the ecological significance and consequent conservation value of both marine and terrestrial ecosystems. Current projects include marine pollution, impact of acidification, shark monitoring, amongst others. Jan 2023: website inaccessible (expired).

CORE sea is a research and marine conservation education organization which works to understand and protect the marine biodiversity of South East Asia, by providing a platform for both research and marine education. Researchers and conservationists develop, test and apply best practices to actively help our deteriorating coral reefs, while students and interns participate in marine conservation oriented projects such as maintaining and establish projects like artificial reefs and coral nurseries, remove ghost nets, clean reefs and beaches.

CPAWS has been advocating for Marine Protected Areas in Canada for more than 20 years. Their mission for Canada’s ocean is quite simply 'more MPAs, better MPAs and MPAs in the right places'. Individual chapters work with Indigenous and local communities to get MPAs and MPA networks established in Canada’s ocean, and to ensure that they are strongly protected and well-managed.

CRAM Foundation is dedicated to the protection of marine life. Its main activity is the clinic and rescue of endangered marine species, which will later be reintroduced to the wild, such as turtles and dolphins. The Foundation also carries out research into marine species and ecosystems, and educates to raise awareness of the need to conserve the oceans. In addition to the state-of-the-art recovery center, with a technical and human team specially trained to assist marine species, as well as the Vell Marí, one of the few scientific sailboats dedicated to the exploration of the marine environment.

Based in Costa Rica, CREMA is marine preservation organization which plays a role in the country's international shark fin trade. The group also does research so that they can protect ocean resources as well as persuade the country (and all Central America) to carry out sustainable fishing policies.

Based in Monterey Bay, California, COA conducts marine research to drive conservation, with the additional aim to educate on marine and conservation issues. In one such project, COA marine biologists travel to Antarctica to conduct cutting-edge research on whale populations and behaviour. By combining research with conservation and education, they are contributing to the understanding and protection of marine mammals worldwide, and ensuring that their populations persevere and thrive into the future.

Canada's Wildlife Foundation has a strong oceans component in which focuses the following key areas: Reducing the impact of Fisheries on Marine Wildlife; Marine Pollution; and Marine Protected Areas. Over fishing is a major area of interest as it is crucial to maintain ample food for marine life that relies on these areas for winter grounds or having their young.

The Cape Cod Commercial Fisherman's Alliance (previously Association) is an alliance of fishermen, community members, public officials and scientists working together to build creative strategies, advocate for improved marine policies, protect the ocean ecosystem, and ensure the viability and future of Cape Cod's fisheries.

Cape Conservation Group, the North West Cape’s conservation organisation is based in Exmouth, Western Australia, covering both land and marine projects. It is a community group, with the aim to “Preserve and protect the North West Cape, now and for future generations”. Their current projects include: PROTECT NINGALOO – Save Exmouth Gulf, Recycling in Exmouth, Developments on North West Cape, Ningaloo Resilient Reefs, Beach Cleanups. Their citizen science projects, involving volunteers, include the Ningaloo Turtle Program.

The Cape Eleuthera Institute (CEI) is a dedicated center for research and innovation at The Island School in South Eleuthera, The Bahamas. CEI promotes ‘the conservation of the tropical marine and coastal ecosystems by facilitating the research of resident and visiting scientists, supporting the education of students at all levels, and spurring outreach efforts to enhance the environmental awareness of local and global communities.’ Students of all ages gain experience regarding conservation, sustainability, and local ecosystems. They collaborate with world-class scientists, doing substantive research, eg. tagging nurse sharks, sea turtle research, all aimed at a better understanding of the environment and how to protect it.

Cape RADD is a marine field station that serves as a platform for researchers in the Cape Town and False Bay area of South Africa. They facilitate SCUBA and freediving training courses for individuals who want to learn more about the marine environment, conservation and research through hands on field experience and diver development. Their courses include training in multiple data collection and field operation techniques, and theoretical workshops and presentations from field biologists and dive experts. They also run a volunteer programme focusing of citizen science research, community awareness, conservation projects and educational outreach.