Not precisely a marine conservation organization, but with the potential to impact on marine conservation significantly, Algaqua is a spin-off project at Malaga University, and in 2020, received the award for best business initiative in the Blue-Growth contest of the Andalusian Marine Maritime Cluster. The project is based on the sustainable production of different aquatic organisms, such as fish and algae, and various plants, mainly in food and other possible applications such as cosmetics or pharmaceuticals. The waste from one is used by other, for example, the nutrient rich water from fish farming is used for in vegetable farming. This system can be used for both freshwater and saltwater, growing both vegetables and algae.

The Allen Coral Atlas maps and monitors the world's coral reefs to provide actionable data and a shared understanding of coastal ecosystems. In 2017, the Atlas was developed through a unique international partnership of remote sensing, conservation, and coral ecology experts who harnessed satellite imagery, machine learning, and big data processing to capture the first high-resolution view of the world's coral reefs.
Now, the full suite of Allen Coral Atlas tools provides a comprehensive and unprecedented picture of changes to coral reefs over time, giving scientists, decision-makers, and the reef management community critically important information urgently needed for rapid response and conservation. The Atlas system is instrumental in spatial planning, protected area management, reef restoration, and coastal protection/disaster risk reduction. (Scubavox note: Check out the great maps and videos on their website.)
The Allen Coral Atlas is an international collaborative partnership, managed by Arizona State University, other past and current partners include Planet Labs, The Arizona State University, The University of Queensland’s Remote Sensing Research Centre, the National Geographic Society and Vulcan Inc.

Alnitak has worked for the past 30 years to protect the biodiversity of the Mediterranean Sea through research, education and community engagement, involving volunteers in their research missions. This has included a successful turtle tagging project, OASIS, and MEDTOP, monitoring the top pelagic species in the Mediterranean. In 1989 Alnitak restored the historical fishing boat Toftevaag with the purpose of developing science and education programs, and have a second ship Va de Bon Coeur.

AAE works to inform and mobilize a 'culture of sustainability that reduces the amount of garbage that reaches our seas'. Based in Spain, they achieve this via a variety of communications platforms including the media, via networking with hundreds of organizations which organize coastal and beach cleanups, and promoting citizen science, to increase awareness of the problem of marine plastic pollution. Their website includes a database in which an analysis of the type of debris collected can be found.

American Cetacean Society aims to protect whales, dolphins, porpoises, and their habitats by educating the public about the problems these animals face. It also provides teachers' guides and fact sheets on marine mammals and allows interested parties to join the group's whale watching trips to Baja. The Society also makes research grants available and is involved in conservation actions.

The main focus of AIEF is to restore the critically endangered staghorn coral through the use of coral nurseries. The first active coral restoration project in Haiti, they use scientifically based methods to monitor the reef and their coral nursery. As a small, young, non-profit they aim to set the standard for coral restoration in Haiti, and impact on the local community via education and outreach programmes to protect the marine ecosystems of the island.

ATMAR Inc. is a community organization in Puerto Rico with the mission to prevent the looting of sea turtle nests and the illegal hunting of sea turtles while they are nesting, and to offer educational services to the community about sea turtles, their habitat, and their protection. They are authorised by the Puerto Rico Department of Natural and Environmental Resources to work with sea turtles that are species protected by law. The organization has an Educational Center - CEATMAR, with a mini-museum, conference room and rooms for volunteers and researchers.

The ASOC Southern Ocean Fisheries Campaign works on five continents to stop the Illegal, Unregulated and Unreported (IUU) fishing that is dramatically depleting toothfish stocks, the most important commercial fish in the Southern Ocean. At the same time, the long-liners are killing thousands of endangered albatrosses and other seabirds each year.

Aquarius Systems is an engineering company which designs equipment for surface water management, with the stated goal 'to make waterways usable and enjoyable. Aquatic weed harvesters, trash skimmer boats, amphibious excavators, aquatic weed cutters and a variety of support equipment will help reclaim lakes, rivers and reservoirs from the unwanted vegetation and floating debris that negatively impact recreation and navigation.'. Their Trash Hunter is designed to collect 'unwanted debris from harbours, rivers and other waterways. The skimmer boats can easily retrieve a wide variety of manmade and organic floating debris including plastic trash, tires, branches and logs.' The Trash Hunter is an example of a debris skimmer, manned technology currently used in lakes and bays to remove debris or weeds cluttering the water. They typically use a belt conveyor, mechanized grabbers, and water jets to direct debris to storage.

ARC Marine is focused on designing, building, deploying and monitoring nature-based solutions for the marine environment. Founded in 2015 by concerned divers, initially the aim was to accelerate reef creation globally via their ‘Reef Cubes’ solution. Their products have since expanded to include ‘Marine crete’, an environment friendly construction material for foundations and marine anchoring; ‘Marine matt’ for subsea protection such as sediment stabilisation; and their ‘Marine armour’ product protects against flooding and coastal erosion.

The Sea Turtle Protection Society of Greece works at the conservation of sea turtles and their habitats in Greece. Main activities are monitoring and research, rescue and rehabilitation of sick and injured turtles and raising public awareness. They run many volunteer programmes, all with the purpose of ensuring the sea turtles are treated correctly, and that injured turtles are released back to the sea as soon as they are better. The Sea Turtle Rescue Center is in Glyfada Attikis and 8 other Sea Turtle Conservation Projects are on Zakynthos, Kyparissia Bay, Crete, south Peloponnese, Amvrakikos, working with the support of volunteers, since 1983.

The Archie Carr Center for Sea Turtle Research (ACCSTR) at the University of Florida was established in 1986 as a Center of Excellence by the University Board of Regents of the State of Florida in recognition of the outstanding achievements and pioneering research of the late Archie Carr. Their research focuses on seeking innovative solutions for sea turtle conservation.