
The African Conservation Foundation, also known as ACF, is an international non-governmental organisation established in 1999 and registered in 2001. Its focus is wildlife and habitat conservation within and outside of protected areas, adopting an integrated approach which includes community development and environmental education. The organisation is registered as a charity, supporting and conducting field conservation projects around Africa. It also maintains an Africa-wide network for information exchange and capacity building of conservation efforts in the region.

Animal Free Research UK (AFRUK), formerly the Dr Hadwen Trust, is a UK medical research charity that funds and promotes non-animal techniques to replace animal experiments. Established in 1970, the work undertaken by Animal Free Research UK develops reliable science whilst avoiding animal testing.

Battersea Dogs & Cats Home, now known as Battersea, is an animal shelter for dogs and cats. Battersea rescues dogs and cats until an owner or a new can be found. It is one of the UK's oldest and best known animal rescue centres. It was established in Holloway, London in 1860 and moved to Battersea in 1871.

Blue Cross is a registered animal welfare charity in the United Kingdom, founded in 1897 as Our Dumb Friends League. The charity provides support for pet owners who cannot afford private veterinary treatment, helps to find homes for unwanted animals, and educates the public in the responsibilities of animal ownership.

British Divers Marine Life Rescue (BDMLR) is a British charity established in 1988 and is the United Kingdom's leading marine mammal rescue organisation. The organisation's main areas of operation are within the United Kingdom and its territorial waters; however, the organisation is often requested to provide assistance and training in marine mammal rescue by international governments and charitable organisations due to their vast wealth of knowledge, experience and available equipment.

British Dressage is the organisation which oversees all affiliated dressage competitions and training in the United Kingdom. British Dressage is a member of the British Equestrian Federation.

British Equestrian is the national governing body of equestrian sport in Great Britain and represents the country at the International Federation for Equestrian Sports (FEI).

The British Horse Society (BHS) is a membership-based equine charity, with a stated vision of "a Society which provides a strong voice for horses and people and which spreads awareness through support, training and education". It currently has more than 110,000 members, with a further 34,000 members affiliated through a British Riding Club, making it the largest equine membership organisation in the United Kingdom. It is one of the 19 organisations which form part of the British Equestrian Federation.

British Showjumping is the Great Britain governing body for the equestrian sport of showjumping. It provides the competitors for Team GBR in international competition and sets the rules under which affiliated competitions are held. It is one of the 16 organisations which form part of the British Equestrian Federation.

The British Trust for Ornithology (BTO) is an organisation founded in 1932 for the study of birds in the British Isles. The Duke of Cambridge has been patron since October 2020.

The Buttercups Sanctuary for Goats is a British charitable organisation devoted to goat welfare. The charity, which is based in Maidstone, Kent, England, was established in 2003. It is the only goat charity in the whole of the UK.

Cats Protection, formerly the Cats Protection League, is a UK charity dedicated to rescuing and rehoming stray, unwanted or homeless cats and educating people about cats and cat welfare. The organisation was founded as the Cats Protection League on 16 May 1927 by Jessey Wade, at a meeting in Caxton Hall, London. The name was shortened in 1998. The current Chief Executive is James Yeates.

Chester Zoo is a zoo at Upton by Chester, in Cheshire, England. Chester Zoo was opened in 1931 by George Mottershead and his family. It is one of the UK's largest zoos at 51 hectares. The zoo has a total land holding of approximately 160 hectares.

Dogs Trust, known until 2003 as the National Canine Defence League, is a British animal welfare charity and humane society which specialises in the well-being of dogs. It is the largest dog welfare charity in the United Kingdom, caring for over 15,000 animals each year. Dogs Trust's primary objective is to protect all dogs in the UK and elsewhere from maltreatment, cruelty and suffering. It focuses on the rehabilitation and rehoming of dogs which have been either abandoned or given up by their owners through rehoming services.

The Donkey Sanctuary is a British charitable organisation devoted to the welfare of donkeys. The charity, which is based near Sidmouth in Devon, England, was founded in 1969. It is one of the largest equine charities in the world with an annual income and expenditure of £37 million.

Elephant Family is an international NGO dedicated to protecting the Asian elephant from extinction in the wild. In the last fifty years their population has roughly halved and 90% of their habitat has disappeared. Poaching, a growing skin trade, and demand for wild-caught calves for tourism remain a constant threat along with the deadly and escalating conflict between people and elephants for living space and food. Elephant Family funds pioneering projects across Asia to reconnect forest fragments, prevent conflict and fight wildlife crime. Since 2002 Elephant Family has funded over 170 conservation projects and raised over £10m through public art events for this iconic yet endangered animal.

Freedom for Animals (FFA) is the working name of the Captive Animals' Protection Society, a charity registered in England campaigning to end the use of animals in entertainment, such as circuses, the exotic pet trade and the audio-visual industry.

The Guide Dogs for the Blind Association, known by the working name Guide Dogs, is a British charitable organisation founded in 1934.

Hearing Dogs for Deaf People is a UK charity which trains dogs to alert deaf people to a variety of sounds.

Hedgehog Care is a British animal welfare rescue, dedicated to the rescue and treatment of hedgehogs. It was founded in 1980 by Elaine Drewery, who continues to operate it. It started from small beginnings with her taking home injured hedgehogs she chanced upon. Then people began bringing animals they found to her and the rescue service grew from there. Drewery has been described as "the doyenne of England's hedgehog ladies" by the Wall Street Journal. Hedgehog Care describes itself as "Lincolnshire's Famous Little Hedgehog Hospital."

Hillside Animal Sanctuary, based in Frettenham, Norwich, and with a site at West Runton, North Norfolk, is the United Kingdom's largest home for different kinds of farm animals and horses. The vegan-run sanctuary is funded entirely on public donations. The sanctuary was established by Wendy Valentine and its patron is actor Martin Shaw.

The Horse Trust is an equine charity in the United Kingdom, based at Speen near Princes Risborough in Buckinghamshire. It was founded in 1886 to help the working horses in London, making it the oldest horse charity in the world. Upon the decline of the working horse in the 1960s it widened its remit to include education and research, becoming the largest provider of equine welfare grants in the United Kingdom.

Hounds for Heroes is a British charity launched in February 2010 to help train and provide service dogs to wounded British Armed Forces and Emergency Services men and women.

The Humane Slaughter Association (HSA) supports research, training, and development to improve the welfare of livestock during transport and slaughter. It provides technical information about handling and slaughter on its website, training for farmer staff and vets, advice to governments and industry, and funding of science and technology to make slaughter more humane. HSA is the sister charity to Universities Federation for Animal Welfare.

International Animal Rescue (IAR) is an animal protection and conservation non-profit organisation that comes to the aid of suffering animals with hands-on rescue and rehabilitation and the protection of wildlife habitats. IAR returns rehabilitated animals to the wild while also providing permanent sanctuary for those that cannot fend for themselves. Its work includes cutting free and caring for captive bears in India and Armenia, rescuing and rehabilitating orangutans and other primates in Indonesia and treating injured and orphaned howler monkeys in Costa Rica. IAR strives to educate the public in the humane treatment of all animals and the preservation of the natural environment. International Animal Rescue has offices in the United Kingdom, United States, India, Indonesia and Malta.

Mayhew, formerly known as The Mayhew Animal Home, is an animal welfare charity working to improve the lives of dogs, cats and the people in local communities – both in London and internationally. Mayhew’s animal shelter, head office and Community Vet Clinic are based in Kensal Green, North London.

The Orangutan Land Trust is a UK charity with the objective of providing sustainable solutions for the long-term survival of the orangutan in the wild by ensuring safe areas of forest for their continued existence. The organizations President and co-founder, Lone Drøscher Nielsen is a prominent wildlife conservationist.

The People's Dispensary for Sick Animals (PDSA) is a veterinary charity in the United Kingdom. It was founded in 1917 by Maria Dickin to provide care for sick and injured animals of the poor. It is the UK's leading veterinary charity, carrying out more than one million free veterinary consultations a year, and was up to 2009 the largest private employer of fully qualified veterinary surgeons and veterinary nurses in the UK, only those living within the PDSA's catchment areas can use their services.

Peoples Trust for Endangered Species (PTES) is a charitable organisation registered in England and Wales. It exists to promote the conservation of rare or declining species and habitats in the UK and worldwide through monitoring, public engagement, education, and through the funding of conservation projects and research. It also owns and manages two nature reserves. As of April 2015, PTES has 16 employees, five trustees and coordinates around 24,000 volunteers in the UK. PTES relies on donations from the general public and grants from trusts and foundations to continue its work - it receives no core funding from the UK Government. The organisation has registered charity number 274206.

The Rare Breeds Survival Trust is a conservation charity whose purpose is to secure the continued existence and viability of the native farm animal genetic resources (FAnGR) of the United Kingdom. It was founded in 1973 by Joe Henson to preserve native breeds; since then, no UK-native breed has become extinct.

Raystede is an animal rescue and sanctuary based in Lewes, East Sussex. They provide rescue, rehabilitation, rehoming and sanctuary to both pets and farm animals.

Redwings Horse Sanctuary is a registered charity that provides a home for rescued horses, based in Norfolk, England.

The Royal Society for the Prevention of Cruelty to Animals (RSPCA) is a charity operating in England and Wales that promotes animal welfare. The RSPCA is funded primarily by voluntary donations. Its patron is Queen Elizabeth II. Founded in 1824, it is the oldest and largest animal welfare organisation in the world and is one of the largest charities in the UK. The organisation also does international outreach work across Europe, Africa and Asia.

The Royal Society for the Protection of Birds (RSPB) is a charitable organisation registered in England and Wales and in Scotland. It was founded in 1889. It works to promote conservation and protection of birds and the wider environment through public awareness campaigns, petitions and through the operation of nature reserves throughout the United Kingdom.

Save the Elephants (STE) is a UK registered charity based in Kenya founded in September 1993 by Iain Douglas-Hamilton. Save the Elephants works to sustain elephant populations and preserve the habitats in which elephants are found, while at the same time fostering a heightened appreciation and visibility for elephants and their often fragile existence. The organization uses a four pillar approach to fulfill its mission statement, combining habitat protection, research, grass roots organization and involvement, and through disseminating information through television, films, publications and new media sources.

The Selborne Society or Selborne League is Britain's oldest national conservation organization. It was formed in November 1885 to "perpetuate the name and interests of Gilbert White, the Naturalist of Selborne", and followed the philosophy of observation rather than collection. Its object was the preservation of birds, plants and pleasant places. It was founded by George Arthur Musgrave and his wife Theresa of Torquay in Devon and it was inspired by Gilbert White's well-known book, The Natural History and Antiquities of Selborne. The society amalgamated with the Plumage League which had been founded by the Reverend Francis Orpen Morris and Lady Mount Temple in January 1886 with the full title of the Selborne Society for the Preservation of Birds, Plants and Pleasant Places while the campaigners against the use of birds for fashion formed the Plumage Section with royal patronage from Princess Christian, daughter of Queen Victoria. From 1887 it started producing the Selborne Letters as well as the Selborne Magazine. The organization became more organized after a meeting held on 26 January 1888, when Alfred, Lord Tennyson was appointed as president. The aim of "education" was added at this meeting. The Selborne Magazine was retitled as Nature Notes from 1890 under the editorship of Percy Myles and James Britten. After Britten's death in 1897 the editor was G. S. Boulger. The Parkinson Society founded in 1884 by Juliana Ewing to encourage gardening also merged into the Selborne Society.

The Shark Trust is a charitable organization founded in the UK in 1997, and is dedicated to promoting the study, management and conservation of sharks, skates and rays (elasmobranchs) in the UK and internationally.

The Society for Abandoned Animals is an animal rescue based in Manchester, United Kingdom. They primarily rescue cats and rabbits and never put a healthy animal down.

The Society for the Protection of Animals Abroad (SPANA) is a global charity with the objective and purpose of providing veterinary care to working animals, including donkeys, horses, elephants and camels.

The Swan Sanctuary, Shepperton is a wildlife hospital dedicated to the treatment, care and rehabilitation of swans and wildfowl in the UK and is situated close to the village of Shepperton in area of Middlesex, England. The Swan Sanctuary is registered with the Royal College of Veterinary Surgeons as Veterinary Premises No. 7002114 - Sally Goulden, B. Vet. Med., Cert. G.P. (SAM), MRCVS

Tiggywinkles is a British animal welfare charity and wildlife hospital, also known as St Tiggywinkles and The Wildlife Hospital Trust. Tiggywinkles, which specialises in the rescue and treatment of wild animals, was founded in 1983 as the Wildlife Hospital Trust by Les Stocker as the United Kingdom's first wildlife hospital. The name derives from the hedgehog character in Beatrix Potter's story The Tale of Mrs. Tiggy-Winkle.

Whale and Dolphin Conservation (WDC) is a wildlife charity that is dedicated solely to the worldwide conservation and welfare of all whales, dolphins and porpoises (cetaceans). WDC is a founding partner of the Convention on Migratory Species, which is part of the United Nations Environment Programme. The organization also develops regional protection agreements and conventions and closely cooperates with the orca research station OrcaLab in British Columbia, Canada.

The Wildfowl & Wetlands Trust (WWT) is an international wildfowl and wetland conservation charity in the United Kingdom. Its patron is Prince Charles, and its president is Kate Humble.

The Wildlife Aid Foundation is a charity dedicated to the rescue, care and rehabilitation of sick, injured and orphaned animals. Based in Leatherhead, Surrey, UK, the centre operates Surrey County's only wildlife hospital and maintains a referral service for wildlife hospitals throughout Europe. The organisation also carries out environmental activist and educational roles. Wildlife Aid has attracted media attention for its rescues of photogenic wild animals like young foxes and baby badgers; Animal Planet's TV program Wildlife SOS chronicles the activities of Wildlife Aid volunteers as they rescue imperiled animals.

Wood Green, The Animals Charity is an English animal welfare charity. The charity was founded in 1924 as a response to the number of animals abandoned on London's streets.

World Animal Protection, formerly The World Society for the Protection of Animals (WSPA) is an international non-profit animal welfare organization that has been in operation for over 30 years. The charity describes its vision as: A world where animal welfare matters and animal cruelty has ended.