PETA UK
The People for the Ethical Treatment of Animals (PETA) Foundation is a UK-based charity dedicated to establishing and protecting the rights of all animals.

Animal Matters
A volunteer-run organization dedicated to promoting the welfare of wild, companion, farm and laboratory animals throughout the world

World Animal Protection
Protect Animals Around The World

Animal Aid
Fighting Animal Abuse & Promoting a Cruelty-free Lifestyle

Animal Rights Action
The knowledge and tools you need to help stop animal cruelty.

Cruelty Free International
Working to end animal experiments worldwide

Care2 Petitions (The Petition Site)
Animal Rights Petitions

Animal Petitions
Humans Defending Animals From Other Humans

The Body Shop
Ban Animal Testing Campaign

WWF
World Wildlife Fund