For the DS9 episode of the same name, please see "Hippocratic Oath".

The Hippocratic Oath was an oath of guidelines and ethics sworn to by Earth physicians, devised by Hippocrates.

In 2152, when explaining the difference between Denobulan and Human medical ethics, Dr. Phlox stated "Hippocrates wasn't Denobulan". (ENT: "The Breach")

The quote from the USS Pasteur's dedication plaque was the first part of the Hippocratic Oath:

"I swear by Apollo the healer, by Aesculapius, by Health and all the powers of healing..." (TNG: "All Good Things...")

The oath was included in the EMH programming. When given the opportunity to kill Unferth in the holodeck, The Doctor told him that the only reason that he wasn't going to kill him was because he had "taken an oath to do no harm." (VOY: "Heroes and Demons") He would later give this as the reason he could not perform the procedure to separate Tuvix in 2372. (VOY: "Tuvix")

In 2373, The Doctor recited to himself a version of the introduction to the oath which went as follows:

"I swear this oath by Apollo physician, by Aesculapius, by Health, and by all the gods and goddesses: In whatsoever place that I enter I will enter to help the sick and heal the injured, and I will do no harm." (VOY: "Darkling")

In 2375, The Doctor, acting in his role as chief medical officer of USS Voyager, visited a holographic program he created of the Cardassian exobiologist Crell Moset to inform him that he had decided to delete his program and all related research due to ethical concerns. In response to this, the hologram stated that to do so would be to violate the first oath he took as a physician: "Do no harm." The Doctor, recalling the atrocities committed by the real-life Moset, told him that he had no right to say those words, and ignoring a final argument, proceeded with his decision. (VOY: "Nothing Human")

This oath was likely part of the EMH program's ethical subroutines, as both The Doctor and the Equinox EMH performed criminal acts of harm after their ethical subroutines were deleted. (VOY: "Equinox, Part II")

In 2377, when his program was stolen by Gar and sold to Chellick, the Jye administrator of a floating hospital on the Dinaali homeworld, The Doctor, activated as Gar and Chellick negotiated over his price, angrily refused to provide his services to "common thieves" - but when victims of a mining accident were brought in seconds later, The Doctor, unable to simply stand and watch, began to treat a seriously injured miner, informing a surprised Chellick that, fortunately for the patient, he was programmed to obey the Hippocratic Oath. (VOY: "Critical Care")

Certain Malcorian physicians swear to an oath similar to the Hippocratic Oath. Berel specifically states "I have sworn an oath to do no harm. And I will not." (TNG: "First Contact")

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