NSA

On All The Tropes, NSA could refer to:

Film

 * No Strings Attached
 * "National Supers Agency", the organization that keeps files on all knows supers in the universe of The Incredibles

Literature

 * New Series Adventures, the Expanded Universe for the post-hiatus Doctor Who continuity

Music

 * Neue Schubert-Ausgabe, the collected works of Franz Schubert


 * National Sound Archive, the audio collection of the British Library (Wikipedia article)

Real Life

 * National Security Advisor, a high-ranking official government position in Canada, India, and the United States of America
 * National Security Agency

Not to be confused with NASA.