The Cloud Appreciation Society is a society founded by Gavin Pretor-Pinney from the United Kingdom in January 2005. The society aims to foster understanding and appreciation of clouds, and has over 22,000 members worldwide from 83 different countries, as of July 2010.
Yahoo named the society's website as "the most weird and wonderful find on the internet for 2005".[1] The group and its founder were the focus of a BBC documentary Cloudspotting, based on Pretor-Pinney's book The Cloudspotter's Guide.[2]