The Omcar Foundation was created in 2007 for the conservation of dugongs, seagrasses, and mangroves through scientific and traditional knowledge. Under the foundation’s auspices, the OMCAR Palk Bay Centre provides services to the local fishing communities in coastal environmental education and awareness, a dugong and marine mammal stranding response, seagrass and mangrove restoration projects, sustainable squid fishery, tree planting, amongst others. Participatory conservation and sustainable livelihoods are key to their mission.

ORCA Ireland's stated aim is 'to enhance our scientific knowledge and understanding of marine megafauna in Irish waters through conservation, research and education.' They monitor marine megafauna (especially cetaceans), both through research with the help of citizen scientists through their mobile phone recording tool, the Observers App, and real-time cetacean acoustics research.

As a grassroots community environment non-profit movement, Ocean Blue Project's mission is to rehabilitate and conserve the world's oceans, beaches, and rivers through beach and river clean-ups. They also provide solutions to keep pollutants from entering ecosystems through collaborative community-driven service learning projects and youth education, specifically their Blue Schools initiative which is an ecology- and sustainability-based K-12 curriculum, empowers students—and communities—to become stewards of their beaches, streams, rivers, and ocean.

OCT is dedicated to connecting people with the ocean, via a diverse array of projects, including habitat restoration via seagrass and coral reef restoration projects, extensive education and ocean literacy programmes, surveys, amongst others.

Ocean Culture Life is ‘a global community of storytellers, photographers, filmmakers and ocean lovers whose lives have been shaped by the sea.’ They highlight the crucial work being done in marine conservation around the world via the medium of photography, film and personal accounts, thus inspiring, creating networks, and enabling knowledge and experience to be shared,

Ocean Exploration Trust and the Nautilus Exploration Program, under the direction of Dr Robert Ballard, seek out new discoveries in geology, biology, and archaeology while conducting scientific exploration of the seafloor. Their expeditions launch aboard Exploration Vessel Nautilus, a 68-meter research ship equipped with live-streaming underwater vehicles for scientists, students, and the public to explore the deep sea from anywhere in the world. Via their communications and education capabilities, they communicate their experiences live as they explore seascapes never seen before, aiming thus to inspire people to care about the oceans and to aspire to ocean exploration. The vessel E/V Nautilus's home port is at the AltaSea facility in San Pedro in the Port of Los Angeles, California.

Jean-Michel Cousteau's society, Ocean Futures Society is committed to educating the public on marine conservation and finding sustainable solutions to protect our ocean planet. From creating educational programs around the world that immerse children in nature, to communicating the importance of sustainable living, to producing documentaries that shed light on the state of the planet.

OMI's objectives are to change people's awareness to better understand the natural world, and to protect ocean mammals. OMI's programs have three goals: To study the impact of human marine activities including noise pollution on whales and dolphins; to apply the results of research to protecting marine mammals and their environment; to allow people to participate fully in their research in order to educate them about important conservation issues and empower them to act responsibly. By doing research to protect the whales and dolphins, people learn they can help preserve biodiversity, including by addressing the problem of pollution. Operates in the US, Alaska and Hawaii

Ocean Missions 'inspires people to take direct action towards ocean conservation by an excellent combination of science, education and adventures program during seasonal expeditions in Arctic regions onboard Schooner Opal in collaboration with NorthSailing'.

The OPLN is 'a diverse group of leaders, organizations and interests, all coming together with one common goal – end the flow of plastics into our oceans. Through healthy debate and a shared vision, OPLN develops the programs and experiences that build relationships, deepen understanding and drive action'. The Network is designed to mobilize brands, materials scientists, innovative technologies and NGOs/activists in the plastic value chain. 'Through education, curated introductions and an online community, we advance solutions-oriented projects and promote ideas from experts and advocates.'

Ocean Recovery Alliance is an NGO based in Hong Kong and California, which focuses on solutions and innovations for reducing plastic pollution on a global scale, including work with the World Bank, UN Environment and Clinton Global Initiative. In 2010, Ocean Recovery Alliance announced two initiative, the Plastic Disclosure Project (www.plasticdisclosure.org), and Global Alert. Both of these are now starting to be used by the World Bank and the United Nations Environment Program (UNEP) for their respective ocean programs. Plastic waste, however, is an issue which effects almost all nations and territories, and is a community and business issue which can be turned into opportunities if the focus is changed to be that of "resource management", not waste handling. The group also founded the Plasticity Forum, focused on the future of plastic and where the leaders are going with innovation, design, materials and solutions: www.plasticityforum.com

Problems accessing website Jan 2023. Ocean Sanctuaries is dedicated to supporting marine citizen science. They offer citizen science programs for both divers and the general public, with the aim to foster greater understanding, wise ecology, species protection and good stewardship of the ocean and related habitats. Ocean Sanctuaries mission is to inspire people to take action around ocean conservation and habitat preservation.