The body was discovered in a building in Sidney Street on Saturday morning.
Officers investigating the circumstances surrounding the death have ruled out foul play.
An inquest into the death will now be held.
A South Yorkshire Police spokeswoman said: "Officers were called to a property in Sidney Street, Sheffield at about 7.20am on Saturday, May 14, where the body of an 18-year-old man was discovered."There are no suspicious circumstances surrounding the death, and a file has been prepared for the coroner."