Astroturfing is a form of advocacy often in support of a political or corporate agenda designed to give the appearance of a "grassroots" movement. The goal of such campaigns is to disguise the efforts of a political and/or commercial entity as an independent public reaction to some political entity—a politician, political group, product, service or event. The term is a derivation of AstroTurf, a brand of synthetic carpeting designed to look like natural grass.

Astroturfers attempt to orchestrate the actions of apparently diverse and geographically distributed individuals, by both overt ("outreach", "awareness", etc.) and covert (disinformation) means.