An autopsy, also known as a post-mortem examination, necropsy (particularly as to animals), or obduction, is a medical procedure that consists of a thorough examination of a corpse to determine the cause and manner of death and to evaluate any disease or injury that may be present. It is usually performed by a specialized medical doctor called a pathologist.

The Chinese were the first to practice the removal and examination of the internal organs of cows. The Egyptians were one of the first civilizations to practice the removal and examination of the internal organs of humans.

Autopsies are either performed for legal or medical purposes. A forensic autopsy is carried out when the cause of death may be a criminal matter, while a clinical or academic autopsy is performed to find the medical cause of death and is used in cases of unknown or uncertain death, or for research purposes.

Autopsies can be further classified into cases where external examination suffices, and those where the body is dissected and an internal examination is conducted. Permission from next of kin may be required for internal autopsy in some cases. Once an internal autopsy is complete the body is reconstituted by sewing it back together.

The prefix 'auto-' means 'self', and so autopsy means 'to see for oneself'; it is used more broadly of personal examination of an object, as well as its specific usage for the post-mortem examination of a human corpse.

Autopsy involves external and internal examination. After the internal examination, the body has an open and empty chest cavity with chest flaps open on both sides, the top of the skull is missing, and the skull flaps are pulled over the face and neck. The body will be stitched to keep the body shape.