The National Anti-Vivisection Society (NAVS) is an international not-for-profit animal protection group, based in London, working to end animal testing, and focused on the replacement of animals in research with advanced, scientific techniques. Since 2006, the NAVS has operated its international campaigns under the working name Animal Defenders International (ADI), and the two groups now work together under the ADI name.

Wilfred Risdon was a British trade union organizer, a founder member of the British Union of Fascists and an antivivisection campaigner. His life and career encompassed coal mining, trade union work, First World War service with the Royal Army Medical Corps (RAMC), political and animal welfare activism.