The International World Wide Web Conference Committee (abbreviated as IW3C2 also written as IW3C2) is a professional non-profit organization registered in Switzerland that promotes World Wide Web research and development.

The IW3C2 was founded by Joseph Hardin and Robert Cailliau at a meeting held in Boston, United States, on 14 August 1994 to prepare for the upcoming Second International World Wide Web Conference in Chicago. The IW3C2 formally became an incorporated entity in May 1996 at the fifth conference in Paris, France.

In 2022 the conference series integrates ACM SIGWEB.

The IW3C2 continues to exist in a different form. This organization no longer manages the conference series and its new role is to deliver the Seoul Test of Time Award and some best papers awards.