Stealth disco (or SD) refers to the act of being videotaped dancing or rocking out behind or near someone who is doing something serious and does not notice. This is sometimes referred to as stealthing (or SD-ing) that person, a process which often concludes with emailing them the footage. The term, if not the activity, was invented by employees at Chicago advertising agency Cramer-Krasselt, circa 2003.

Stealth disco is an example of an Internet phenomenon.