On Wednesday, two alleged self-portraits of a woman in the nude hit the internet, both featuring a face appearing to belong to the Lost in Translation actress.
"The FBI is aware of the alleged hacking incident and is looking into it," an FBI official told the site.
In the last year, the FBI has also investigated nude photo hackings for Jessica Alba and Vanessa Hudgens. It is thought that the alleged Johansson photos could be linked to those earlier celebrity-targeted hackings.
Reps for the 26-year-old actress did not immediately respond to TVGuide.com's request for comment.