Smiley Face Killers: The Hunt for Justice is an American television docuseries that originally aired from January 19 to February 23, 2019 on Oxygen. It examines possible victims of the smiley-face murder theory. Produced by Alison Dammann, the six episodes focus on cases of young men who have disappeared and whose bodies are found in a body of water some time later.

Smiley-face graffiti has been found at most of the crime scenes, which is how the cases are connected. All deaths have been ruled as an undetermined or accidental drowning. The show seeks to look at these cases and find a connection to the smiley-face murder theory in hopes of reopening the cases and redefining the causes of death.