| Yamnuska Wolfdog Sanctuary | Wolfdog Rescue | | | |
| Wildlife Sense | Turtle conservation | | | |
| Wildlife Rescue Centre Jogja | Wildlife conservation, rehabilitation, community outreach | | | |
| Wildlife ACT (2) | Turtle conservation, endangered species monitoring, marine conservation, ecosystem restoration | | | |
| Wildlife ACT (1) | Endangered African Wildlife Conservation | | | |
| Wild Sun Rescue Center | Rescue, rehabilitate, and release local wildlife back to its natural habitat | | | |
| Wembury Marine Centre (Devon Wildlife Trust) | Marine conservation and education | | | |
| Watamu Marine Association | Marine Mammal Research and Conservation | | | |
| Volunteering With India | Volunteer Elephants in India | | | |
| Vervet Monkey Foundation | Primate rehabilitation | | | |
| Utila Dive Centre | Lionfish, dolphin conservation and coral restoration | | | |
| Un poco del Choco | Bird, insects, flora and large mammal conservation | | | |
| UmPhafa Private Nature Reserve | Wildlife Conservation and Reserve Management | | | |
| Turtle and Reef Experience | Turtle and coral conservation | | | |
| Trunks and Leaves | Asian elephant research and conservation | | | |
| Tropical Research and Conservation Centre | Coral reef restoration | | | |
| Tree Roo Rescue And Conservation Centre | Tree Kangaroo Conservation and rehabilitation | | Australia and New Zealand | |
| Toucan Rescue Ranch | To rescue, rehabilitate, and release Costa Rican wildlife | | | |
| Tortugas de Pacuare | Turtle conservation | | | |
| Tolga Bat Hospital | Bat Conservation and rehabilitation | | Australia and New Zealand | |
| Togean Conservation Foundation | Marine and terrestrial ecosystem restoration | | | |
| Tobacco Caye Marine Station | Marine internship | | | |
| Thula Thula | Elephant, safari, wildlife rehabilitation | | | |
| The Sloth Institute | Sloth conservation | | | |
| The Maru | Monitoring and Conservation of Lake Malawi's cichlid fish | | | |
| The Leatherback Trust | Turtle conservation | | | |
| The Atlantic Whale and Dolphin Foundation (AWDF) | Whale and dolphon conservation | | | |
| Terra Sylvestris (2) | Rewilding land and sea | | | |
| Terra Sylvestris (1) | Environmental justice, terrestrial and marine conservation | | | |
| Tambor Bay Turtles/ Tortugas Bahia Tambor | Sea Turtle Conservation Project | | | |
| Sumatra Rainforest Institute | Rainforest conservation, tiger and orangutan conservation | | | |
| Stitchting AAP | Rehabilitation of exotic mammals | | | |
| St Abbs and Eyemouth Voluntary Marine Reserve | Marine community conservation | | | |
| Sri Lanka Wildlife Conservation Society | Human elephant conflict mitigation and research for Asian elephant conservation | | | |
| South African Shark Conservancy | Shark conservation | | | |
| Song saa Foundation | Marine conservation and development | | | |
| Shark Life | Shark conservation | | | |
| Sealcentre Pieterburen | Rehabilitation of common and grey seals | | | |
| Seal Rescue Ireland (2) | Seal Rehabilitation and Environmental Education | | | |
| Seal Rescue Ireland (1) | Seal Rehabilitation and Environmental Education | | | |
| Sea Sanctuaries | Coral reef management and conservation | | | |
| Savannah Science Museum, Inc. | Sea Turtle research and conservation | | | |
| SEED Madagacar | Lemurs, reptiles and amphibian conservation | | | |
| SAFE Project | Tropical forest conservation | | | |
| Roatan Institute for Marine Sciences (RIMS) | Coral reef and dolphin conservation | | | |
| Rescate Wildlife Rescue Center (formerly Rescate Animal Zoo Ave) | Endangered species rescue and rehabilitation center | | | |
| Reef Doctor (3) | Mangrove conservation | | | |
| Reef Doctor (2) | Coral reef research assistant | | | |
| Reef Doctor (1) | Coral reef eco diver | | | |
| Rascarey | Turtle conservation | | | |
| Rainfer chimp foundation | Primate rehabilitation and conservation | | | |
| Quantum Scubabo | Coral reef conservation | | Australia and New Zealand | |
| Pupu Rangi Nature Sanctuary | Kiwi, possum, small mammal monitoring and conservation management | | Australia and New Zealand | |
| Project Manaia | Seagrass habitats, Invasive Species and Marine debris focus | Greece, Albania, Montenegro and Croatia | | |
| Planet Drum Foundation | Dry Tropical Forest Revegetation and Bioregional Education Project | | | |
| People And The Sea | Coral reef and community conservation | | | |
| Oyster Worldwide (4) | Volunteer with monkeys and baboons in South Africa | | | |
| Oyster Worldwide (3) | Elephant sanctuary volunteering in Thailand | | | |
| Oyster Worldwide (2) | Volunteer with sea turtles in Costa Rica | | | |
| Oyster Worldwide (1) | Volunteer with bears in Romania | | | |
| Orangutan Foundation | Orangutan Conservation Volunteer Programme | | | |
| Operation Wallacea (9) | Grassland, forest, butterfly and bear conservation | | | |
| Operation Wallacea (8) | Tropical forest conservation | | | |
| Operation Wallacea (7) | Coral reef conservation | | | |
| Operation Wallacea (6) | Tropical forest and jaguar conservation | | | |
| Operation Wallacea (5) | Coral reef and turtle conservation | | | |
| Operation Wallacea (4) | Tropical cloud forest conservation | | | |
| Operation Wallacea (3) | Coral reef conservation | | | |
| Operation Wallacea (2) | Coral reef conservation | Indonesia (Wakatobi National Park) | | |
| Operation Wallacea (13) | Biodiversity and neotropical forest megafauna research | | | |
| Operation Wallacea (12) | Large mammal and Fynbos biodiversity research | | | |
| Operation Wallacea (11) | Amazonian research | | | |
| Operation Wallacea (10) | Grasshopper, butterfly, tortoise and terrapin conservation | | | |
| Operation Wallacea (1) | Tropical forest conservation | | | |
| Oceanomare Delphis Onlus (ODO) - Ischia Dolphin Project | Mediterranean Whale and Dolphin Conservation | | | |
| Oceanlife Conservation | Turtle and shark conservation | | | |
| Oana Namibia | Re-Wilding Oana Nature Reserve | | | |
| O.R.C.A Foundation (Ocean Research Conservation Africa) | Humpback dolphin ID and seabird rehabilitation | | | |
| New Heaven Reef Conservation | Coral reef conservation | | | |
| Nakavango Conservation Project | Conservation volunteer programme for reserve and Black Rhino protection | | | |
| Naankuse Foundation | Wildlife conservation, habitat conservation, cultural conservation, humanitarian work | | | |
| Muller stud volunteer | Conservation management and husbandry | | | |
| Montenegro Dolphin Research | Research and public outreach to understand and protect the dolphins of Montenegro | | | |
| Moidjio CRCAD (Centre for Research, Conservation And Development) | Marine mammals, turtles and wildlife of Comoros Islands conservation | | | |
| Mexican Caribbean Manta Ray Project | Manta conservation | | | |
| Me.Ri.S | Research and cetacean data collection | | | |
| Mauritian Wildlife Foundation (4) | Passerines Conservation | | | |
| Mauritian Wildlife Foundation (3) | Kestrel Conservation | | | |
| Mauritian Wildlife Foundation (2) | Echo Parakeet conservation | | | |
| Mauritian Wildlife Foundation (1) | Pink Pigeon Conservation | | | |
| Marine Turtle Conservation Project / Society for the Protection of Turtles (SPOT) | Marine Turtle Conservation | | | |
| Marine Megafauna Foundation (2) | Marine megafauna conservation | | | |
| Marine Megafauna Foundation (1) | Marine megafauna conservation | | | |
| Marine Mammals Research Association (DMAD) | Conservation and Scientific Research on Cetaceans | | | |
| Marine Environment Research Association (AIMM) | Protecting marine wildlife through research and education | | | |
| Marine Dynamics Academy - Internship | Dolphin, whale, shark and seal research | | | |
| Marine Dynamics - International Marine Volunteers | Dolphin, whale, shark and seal research | | | |
| Marine Conservation Philippines | Coral reef and community conservation | | | |
| Marine Conservation Cambodia | Marine Conservation | | | |
| Marine Action Research (MAR) | Humpback whale, Manta ray and Nudibranch conservation | | | |
| Manu National Park | Tropical forest management | | | |
| Madagascar Biodiversity Partnership | Habitat restoration and critically endangered lemur monitoring | | | |
| Madagasar Whale Shark Project (MWSP) | Whale shark conservation | | | |
| Macaw Recovery Network | Recover endangered neotropical parrot populations | | | |
| MEMANTA | Sea turtle and Habitat Conservation | | | |
| Love The Oceans | Humpback whale, fisheries, coral reef, ocean trash and community outreach. | | | |
| Life Net Nature | Cloud Forest Bird Monitoring in Ecuador | | | |
| Life Net Nature | Giraffe Monitoring and Conservation in Western Kenya | | | |
| Lemur Rescue Centre | Lemur conservation | | | |
| Latin American Sea Turtles (LAST) | Sea turtle nesting research | | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (6) | Whale Shark conservation | | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (5) | Whale Shark conservation | | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (3) | Whale Shark conservation | Philippines (Southern Leyte) | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (3) | Whale shark conservation | | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (2) | Manta ray conseravtion | | | |
| Large Marine Vertebrates Research Institute (LAMAVE) (1) | Turtle conservation | | | |
| LIONSROCK Big Cat Sanctuary | Big cat sanctuary | | | |
| LEO Africa | Big 5 conservation - Rhinoceros, Elephant, Buffalo, Lion, and Leopard | | | |
| Kindred Spirit Elephant Sanctuary | Elephant research and conservation | | | |
| Kids Saving The Rainforest (KSTR) | Sloths, rainforest, wildlife rehabilitation and conservtion | | | |
| Karumbé | Sea Turtle Conservation
| | | |
| Kanahau | Bats, Snakes, Lizards and other terrestrial conservation | | | |
| KOPEL (Koperasi Pelancongan Mukim Batu Puteh Kinabatangan Bhd) | Wildlife habitat restoration | | | |
| Institute for Marine Research (2) - Research Fellow | Research on coastal marine ecosystems | | | |
| Institute for Marine Research (1) - Research Assistant | Research on coastal marine ecosystems | | | |
| Innoceana | Marine conservation at Caño Island Biological Reserve | | | |
| Indo Ocean Project (2) | Divemaster training with marine conservation | | | |
| Indo Ocean Project (1) | Divemaster training with marine conservation | | | |
| Iguana Station | Conservation of the endemic spiny Iguana | | | |
| Hoga Island Marine Station (2) | PADI Divemaster course focusing on reef ecology and species identification | | | |
| Hoga Island Marine Station (1) | Coral Reef Restoration Research Project | | | |
| Great Baikal Trail | Trail-building and ecological education | | | |
| Gili Shark Conservation | Shark, reef and community conservation | | | |
| Friends of Midway Atoll National Wildlife Refuge | Conserve and restore habitat for indigenous flora and fauna | | | |
| Free to be Wild | Wildlife / Primate rescue, rehabilitation and release centre | | | |
| Field Projects International | Field Projects International | | | |
| Feracare wildlife centre | Cheetah conservation | | | |
| Evolve Abroad | Wildlife management conservation research | | | |
| EcoLife Expeditions (3) | Coral reef, dolphin and mangrove conservation | | | |
| EcoLife Expeditions (2) | Wildlife management conservation research | | | |
| EcoLife Expeditions (1) | Rhino and elephant professional veterinary conservation | | | |
| East African Whale Shark Trust | Monitoring whale shark populations | | | |
| ECOTEER (4) | Teaching green education | | | |
| ECOTEER (3) | Coral reef and seagrass | | | |
| ECOTEER (2) | Animal and poacher tracking | | | |
| ECOTEER (1) | Turtle conservation | | | |
| Drakenstein Lion Park | Lion sanctuary | | | |
| Delfini del Ponente - Dolphin Research Project | Bottlenose dolphins monitoring and assessment of human interaction with dolphins | | | |
| Daktari Bush School & Wildlife Orphanage | Community environmental education | | | |
| DIY Wild | Wildlife Rescue and Rehabilitation | | | |
| Coral Heroes | Coral Reef restoration through local empowerment | | | |
| Coral Cay Conservation | Marine Protected Area establishment and assessment
| | | |
| Conservation, Animal Rehabilitation and Education (C.A.R.E.) | Conserve, Rescue, Rehabilitate and Release South Africa's WIldlife, Specialising in Baboons | | | |
| Conflict Islands Conservation Initiative (CICI) | Shark, ray and turtle conservation | | | |
| Colobus Conservation & Rescue | Primate conservation & Rescue | | | |
| Cetacean Research & Rescue Unit (CRRU) | Whale and Dolphin scientific research, marine conservation and educational outreach | | | |
| CREES Foundation | Rainforest species monitoring & regeneration | | | |
| Bumblebee Conservation | Bumblebee conservation | | | |
| British Antarctic Survey (BAS) (2) | Ecosystems, Climate, Ocean. Polar Science station | | | |
| British Antarctic Survey (BAS) (1) | Ecosystems, Climate, Ocean. Polar Science station | | | |
| Borneo Nature Foundation | Rainforest, orangutan, gibbon and wildcat conservation | | | |
| Boots on the Ground | Rhino monitoring & wildlife conservation | | | |
| Blue Ventures (3) | Marine conservation expedition in Belize | | | |
| Blue Ventures (2) | Marine conservation expedition in Timor-Leste | | | |
| Blue Ventures (1) | Marine conservation expedition in Madagascar | | | |
| Blue Corner Marine Research | Coral Reef Restoration | | | |
| BirdLife South Africa – White-winged Flufftail Conservation Project | Research and conservation of waterbirds and wetlands | | | |
| Biosphere Expeditions (9) | Bear, wolf, lynx wilderness conservation | | | |
| Biosphere Expeditions (8) | Coral reef conservation | | | |
| Biosphere Expeditions (7) | Coral reef conservation | | | |
| Biosphere Expeditions (6) | elephant, buffalo, leopard, hippo and lion conservation (safari) | | | |
| Biosphere Expeditions (5) | Big Five conservation: leopard, lion, elephant, buffalo and rhino (safari) | | | |
| Biosphere Expeditions (4) | Wolf conservation | | | |
| Biosphere Expeditions (3) | Turtle conservation | | | |
| Biosphere Expeditions (2) | Whales, dolphin and turtle conservation | | | |
| Biosphere Expeditions (13) | Snow leopard conservation | | | |
| Biosphere Expeditions (12) | Elephant conservation | | | |
| Biosphere Expeditions (11) | Brown bear conservation | | | |
| Biosphere Expeditions (10) | leopard and fynbos conservation | | | |
| Biosphere Expeditions (1) | Arabian Oryx and desert conservation | | | |
| Barefoot Conservation | Manta ray and coral reef conservation | | | |
| Bambelela Wildlife Care and Vervet Monkey Rehabilitation | Primate Rehabilitation Centre | | | |
| Atoll Volunteers | Marine Conservation and Turtle Rehabilitation | | | |
| Askari Conservation | South African wildlife and wilderness conservation | | | |
| Archipelagos (4) | Chameleon, Jackal, birds, habitat conservation | | | |
| Archipelagos (3) | Microplastic, water quality, soil quality conservation | | | |
| Archipelagos (2) | Dolphins, whales, monk seals and turtle conservation | | | |
| Archipelagos (1) | Fisheries, seagrass, coralligene and GIS | | | |
| Archelon The Sea Turtle Protection Society of Greece | Turtle conservation | | | |
| Arc Amazon | Wildlife monitoring | | | |
| Animal Aware | Rescue abused and abandoned dogs and cats | | | |
| Amiga Island Ecological Foundation | Coral conservation and restoration | | | |
| Amazoonico | Rehabilitation and reintroduction of wildlife victims of trafficking. Care for unreleased animals and environmental education | | | |
| Aldeas de Paz | Marine Conservation | | | |
| African Dream Horse Safari | Equestrian, Wildlife and Dog Outreach | | | |
| African Conservation Foundation | Rainforest and savanna conservation | | | |
| African Campus (2) | Oceans research internship | | | |
| African Campus (1) | Wildlife research internship | | | |
| ARCAS (2) | Sea Turtle, Crocodile and Mangrove Conservation | | | |
| ARCAS (1) | Wildlife rescue and rehabilitation | | | |
