Stephen William Buchanan Coleridge (31 May 1854 – 10 April 1936) was an English author, barrister, opponent of vivisection, and co-founder of the National Society for the Prevention of Cruelty to Children.

[3] Coleridge came to widespread public attention in England in 1903, when he publicly accused William Bayliss of the Department of Physiology at University College London of having broken the law during an experiment on a dog, thereby sparking the Brown Dog affair.

[4] Coleridge was president of the League for the Prohibition of Cruel Sports and director of the National Anti-Vivisection Society.

[6] Under leadership of the National Anti-Vivisection Society, Coleridge supported restrictionist legislative proposals for vivisection.

In response, Frances Power Cobbe formed the British Union for the Abolition of Vivisection.