1824

Society for the Prevention of Cruelty to Animals / Royal Society for the Prevention of Cruelty to Animals (1840) (RSPCA)

1839

Scottish Society for the Prevention of Cruelty to Animals (SSPCA)

1847

Vegetarian Society of the United Kingdom

1850

American Vegetarian Society (disbanded 1862)

1859

Metropolitan Drinking Fountain Association / Metropolitan Drinking Fountain and Cattle Trough Association (1867) / Drinking Fountain Association (2011)

1860

Battersea Dogs' Home

1866

American Society for the Prevention of Cruelty to Animals (ASPCA)

1867

Pennsylvania Society for the Prevention of Cruelty to Animals (PSPCA)

1868

Massachusetts Society for the Prevention of Cruelty to Animals (MSPCA)

1869

Women’s Humane Society for the Prevention of Cruelty to Animals / Women’s Animal Center (2018)

1875

Victoria Street Society for the Protection of Animals Liable to Vivisection aka Victoria Street Society / National Anti-Vivisection Society (NAVS) [UK] (1898)

1876

Scottish Anti-Vivisection Society / Animal Concern (1988)

London and Provincial Anti-Vivisection Society (merged into NAVS [UK] 1957)

1877

International Humane Association / American Humane Association a.k.a. American Humane (1878)

1883

American Anti-Vivisection Society / American Society for the Restriction of Vivisection (1885) / American Anti-Vivisection Society (1888)

1885

Plumage League [first of two groups formed under this name] (subsumed into Selborne Society 1886)

Selborne Society for the Preservation of Birds, Plants, and Pleasant Places (aka Selborne Society)

1886

Home of Rest for Horses / The Horse Trust (2006)

American Vegetarian Society (disbanded 1921)

1888

London Vegetarian Society (merged into Vegetarian Society 1969)

1889

Plumage League [second of two groups formed under this name] (amalgamated with Fur, Fin and Feather Folk into RSPB 1889)

Fur, Fin and Feather Folk (amalgamated with Plumage League into RSPB 1889)

Society for the Protection of Birds / Royal Society for the Protection of Birds (1904) (RSPB)

1891

National Canine Defence League / Dogs Trust (2003)

1892

Sierra Club

1895

New England Anti-Vivisection Society (NEAVS)

1897

Our Dumb Friends’ League / The Blue Cross (1950) / Blue Cross (2011)

1898

British Union for the Abolition of Vivisection / Cruelty Free International (2015)

1899

Animal Rescue League of Boston

1905

Audubon Society

1907

Society for the Prevention of Abuse in Animal Experimentation (disbanded 1914)

1908

New York Anti-Vivisection Society (disbanded 1938)

c.1910

National Society for the Humane Regulation of Vivisection (disbanded >1958)

1911

Vivisection Investigation League (subsumed into The Last Post Animal Sanctuary c.1989)

1914

Performing and Captive Animals’ Defence Society (disbanded 2006)

1924

League for the Prohibition of Cruel Sports / League Against Cruel Sports (1938)

1925

Anti-Steel Trap League (disbanded ~1958, exact date disputed)

1926

University of London Animal Welfare Society / Universities Federation for Animal Welfare (1938)

1927

Cats Protection League / Cats Protection (1998)

International League for the Protection of Horses / World Horse Welfare

Pit Ponies’ Protection Society

1929

National Anti-Vivisection Society [US]

Emergency Conservation Committee (disbanded 1942)

1932

National Society for the Abolition of Cruel Sports (assets transferred to Care for the Wild 1982)

1935

National Wilderness Society

1936

National Wildlife Foundation

1944

Vegan Society

1947

Defenders of Furbearers / Defenders of Wildlife (1959)

1948

National Humane Education Society

1950

World Federation for the Protection of Animals (merged with International Society for the Protection of Animals into World Society for the Protection of Animals 1981)

1951

Animal Welfare Institute

1952

Mary Mitchell Humane Fund (subsumed into Massachusetts SPCA c.?)

1954

National Humane Society / Humane Society of the United States (1956)

1955

Society for Animal Protective Legislation (political arm of Animal Welfare Institute)

1957

Captive Animals’ Protection Society

Friends of Animals

1959

National Catholic Society for Animal Welfare / Society for Animal Rights (c.1973) / International Society for Animal Rights (1977)

International Society for the Protection of Animals (merged with World Federation for the Protection of Animals into World Society for the Protection of Animals 1981)

1960

American Vegan Society

1963

Hunt Saboteurs Association

1967

Compassion in World Farming

United Action for Animals

The Fund for Animals (entered into partnership with HSUS 2005)

Committee for Humane Legislation (lobbying arm of Friends of Animals) (inactive since 2009(?))

1968

Animal Protection Institute (merged into Born Free USA 2007)

United Animal Defenders

1969

The Donkey Sanctuary

Fund for the Replacement of Animals in Scientific Experiments

International Association Against Painful Experiments on Animals

Friends of the Earth

1971

Friends of the Earth UK

1972

Animal Liberation Front

1973

Chickens’ Lib (disbanded 2010)

1974

North American Vegetarian Society

Animal Rights International (disbanded ~1998)

1975

Greenpeace USA

1976

International Donkey Protection Trust

1977

Animal Liberation Front [US]

Animal Aid

Greenpeace UK

1979

Sea Shepherd Conservation Society

Attorneys for Animal Rights / Animal League Defense Fund (1984)

Animal Rights Network (disbanded 2001)

1980

People for the Ethical Treatment of Animals (PETA)

1981

World Society for the Protection of Animals (merger of World Federation for the Protection of Animals and International Society for the Prevention of Cruelty to Animals) / World Animal Protection (2014)

1982

Care for the Wild International

1984

Born Free Foundation

1985

Lynx (disbanded 1992)

1987

Whale and Dolphin Conservation

1989

Center for Biological Diversity

1990

Animal Defenders International

1997

Shark Trust

2002

Born Free USA

2010

Hounds Off