Through research and conservation projects, campaigns, environmental education, and involvement in a range of important international committees, OceanCare undertakes concrete steps to improve the situation for wildlife in the world’s oceans. In 2011, OceanCare was granted Special Consultative Status on marine issues with the Economic and Social Council of the United Nations.

Initiated by Dutch teenager Boyan Slat in 2013, The Ocean Cleanup is designing and developing cleanup systems to clean up what is already polluting our oceans and to intercept plastic on its way to the ocean via rivers via their Interceptors. The Ocean Cleanup's team consists of more than 120 engineers, researchers, scientists and computational modelers working daily to rid the world's oceans of plastic.

The Ocean Conservation Namibia Trust (OCN) has the primary focus on ocean rubbish and plastic pollution and the resulting entanglement of marine wildlife, particularly seals, along the Namibian Coast. 

Ocean Conservation Research is focused on understanding the scope of, and exploring solutions for, the growing problem of human generated noise pollution and its impact on marine life. They use their research to inform the public and provide guidance to regulators and policymakers so that all may become better stewards of the sea

Ocean Crusaders specialises in waterway cleaning on a large scale. The campaign is focused on ensuring that the oceans, waterways and beaches are clean and safe for all animals. They operate a Social Enterprise, working for government organisations and large corporations to clean waterways on a regular basis with a core crew. This helps fund community programs that involve their Paddle Against Plastic campaign and major beach and island clean ups. They also have a presence in Sweden

Operating from ship and shore, ODA's all-volunteer boat and dive crews remove derelict fishing nets, traps, lines, plastic, and other man-made debris threatening ocean wildlife and habitats. ODA has two main geographical areas of operation. We have boats, divers, and onshore volunteers stationed in Southern California and the Hawaiian islands.

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

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

OVI was founded in 1979 by a group of international sailors, educators, and conservationists with a mission of teaching maritime arts and sciences and preserving the world’s oceans. In 2009, Project Kaisei was launched to focus on major ocean clean-up and to raise awareness regarding the global problem of marine debris/ocean trash. They conduct scientific expeditions to collect debris including ghost nets, and to sample and collect data with the aim of advancing research via analysis of marine debris for the development and testing of collection equipment. As of June 2022 they have collected over 500 000 lbs of plastic, including from the Pacific Gyre.

A global conservation organization, Ocean Wise operates an number of programmes involving research and education regarding the threats facing the oceans, such as Ocean Wise Seafood which is a sustainable seafood program, Sea forestation which involves restoring, planting, managing and caring for underwater seaweed forests, their Cleanup programme and plastic pollution initiative, marine research and education

OceanCycle is a social enterprise reimagining the circular economy through sourcing, certifying and reusing materials to prevent ocean plastic pollution.