Mission Green Sri Lanka engages local communities and especially young people in environmental projects, including mangrove planting, beach and river cleanups to combat plastic pollution, amongst other projects on land and sea.

Moidjio is a Comorian research and conservation group which focuses on cetacean and turtle conservation projects, undertaking acoustic, cetacean monitoring and turtle monitoring projects. They also work to stop poaching of sea turtles on the islands and develop a sustainable ethical whale watching industry. They are working on humpback whales, spinner dolphins, green and hawksbill turtles, lemurs, mangroves, seagrass meadows and coral reefs. Their work includes tree planting to protect against erosion, research into mangroves, sea grass and coral reefs. They study sea and terrestrial birds, lemurs and Livingston bats on the islands; plus education programmes in sustainability and English in the local communities.

This non-profit public aquarium in Monterey, California, is known for its regional focus on the marine habitats of Monterey Bay, it was the first to exhibit a living kelp forest when it opened in October 1984. Its biologists have pioneered the animal husbandry of jellyfish and it was the first to successfully care for and display a great white shark. The organization's research and conservation efforts also focus on sea otters, various birds, and tunas. Seafood Watch, a sustainable seafood advisory list published by the aquarium beginning in 1999, has influenced the discussion surrounding sustainable seafood.

Morigenos' focus is on the study and preservation of cetaceans, including dolphins and sea turtles, and their ecosystems in the Northern Adriatic sea, through knowledge, conservation and awareness actions. They run dolphins research courses for members of the public.

The Northland-based Mountains to Sea Conservation Trust was established in 2002, as a charitable umbrella for the Experiencing Marine Reserves (EMR) marine education and Whitebait Connection (WBC) freshwater education programmes. 

The Namibian Dolphin Project is a research and conservation organization run by several independent scientists and educators. Their mission is primarily to research Namibia’s cetaceans to generate data on these populations that can be used for their conservation through management. Their focus is on coastal dolphins, as well as humpback whales, right whales and leatherback turtles. Additionally they are work with the community through an outreach programme to increase awareness of the Namibia’s marine life.

One of the largest non-profit scientific and educational organizations in the world, the National Geographic Society is one of our planet's greatest advocates, educating and protecting the natural world.

Nature Seekers is a community-based organization founded in 1990 with the aim of protecting leatherback turtles in Trinidad and Tobago. In addition to the protection of nesting turtles, they are involved in research, including tagging and monitoring turtles, and educating the public about marine issues. They are known for their Ecotours which focus on the leatherback turtles.

Nature Trust (Malta) is one of the oldest non-governmental organisations dealing with the natural environment in the Maltese Islands. Their main focus is on site management of natural areas, environmental education and lobbying for effective environmental legislation. They are also involved in the Rescue of injured marine turtles and stranded dolphins. NTM has a team of dedicated rescue volunteers all professionally trained.

Nature's Valley Trust is a non-profit organisation in South Africa whose mission it is to maintain the long term environmental integrity of Nature's Valley, a village on the coast in the Western Cape, and surrounding coastal areas. Their work includes engagement with local communities, education and research.

Nausicaa is the largest public aquarium of Europe. Beyond an aquarium, it aims to be a centre in which an awareness of the need to protect the marine environment is communicated to all visitors.

The Organization for the Conservation of Cetaceans (OCC) in Uruguay works for the conservation of the marine ecosystem as well as the environment of the coastal communities, thus integrating ecological, socio-cultural and economic perspectives. They focus on marine conservation environmental education and awareness, responsible marine tourism, sustainable fishing and the creation of offshore MPAs.