Stellar Wind or Stellarwind is the code name of information collected under the President's Surveillance Program (PSP). The National Security Agency (NSA) program was approved by President George W. Bush shortly after the September 11, 2001 attacks and was revealed by Thomas Tamm to The New York Times in 2008. Stellar Wind was a prelude to new legal structures that allowed President Bush and President Barack Obama to reproduce each of those programs and expand their reach.

A stellar wind is a flow of gas ejected from the upper atmosphere of a star. It is distinguished from the bipolar outflows characteristic of young stars by being less collimated, although stellar winds are not generally spherically symmetric.