Untold Stories of the E.R. is an American docudrama television series which airs on TLC and Discovery Life.

In this program, real-life emergency department doctors discuss their most bizarre and puzzling cases. Typically these involve medical sabotage, violently or strangely acting patients, life-threatening injuries, or even situations in which the E.R. physician is too overwhelmed or unequipped to handle the caseload but cannot transfer responsibility for the patient(s) to someone else.

The show follows a docudrama format in which the real-life E.R. physician narrates through a series of "talking head" clips, while their interactions with the patient are reenacted. The doctors often play themselves, and whenever possible, the patients themselves take part in the reenactment as well. In addition, the patients are sometimes shown in brief interviews to explain what happened during their ordeal. Occasionally, patients' names are changed, and actors play their roles. All cases are based on actual events but may have the surrounding circumstances changed for the sake of dramatization and not necessarily accurate from a clinical or technical standpoint.

On November 11, 2015, the show was renewed through season 11. The show began its 15th season in 2020.