- Animal Welfare Institute193
- Eddy, Sarah J. (Sarah Jane), 1851-1945138
- Leffingwell, Albert, 1845-1916138
- Stevens, Christine76
- Royal Society for the Prevention of Cruelty to Animals45
- British Union for the Abolition of Vivisection42
- National Council for Animals' Welfare34
- Victoria Street Society for the Protection of Animals from Vivisection, united with the International Association for the Total Suppression of Vivisection32
- League for Prohibition of Cruel Sports31
- Animal Defence and Anti-Vivisection Society25
- National Society for the Abolition of Cruel Sports25
- Universities Federation for Animal Welfare20
- University of London. Animal Welfare Society19
- National Anti-Vivisection Society16
- People's Dispensary for Sick Animals (Great Britain)16
- American Humane Association15
- Hadwen, Walter R. (Walter Robert), 1854-193213
- Society for Animal Protective Legislation13
- Cobbe, Frances Power, 1822-190412
- United States. Congress12