Andreas Heldal-Lund was a Norwegian anti-Scientology activist best known for operating the website Operation Clambake.

Operation Clambake, also referred to by its domain name, xenu.net, is a website and Norway-based non-profit organization, launched in 1996, founded by Andreas Heldal-Lund, that publishes criticism of the Church of Scientology. It is owned and maintained by Andreas Heldal-Lund, who stated that he supported the rights of all people to practice Scientology or any religion. Operation Clambake has referred to the Church of Scientology as "a vicious and dangerous cult that masquerades as a religion". The website includes texts of petitions, news articles, exposés, and primary source documents. The site has been ranked as high as the second spot in Google searches for the term "Scientology".