"Hippocratic Oath" is the 76th episode of the syndicated American science fiction television series Star Trek: Deep Space Nine. It is the fourth episode of the fourth season and is directed by castmember René Auberjonois (Constable Odo).

Set in the 24th century, the series follows the adventures on Deep Space Nine, a space station located near a stable wormhole between the Alpha and Gamma quadrants of the Milky Way Galaxy.

Miles O'Brien (Colm Meaney) and Julian Bashir (Alexander Siddig) clash when their runabout crashes on a planet that is home to several rogue Jem'Hadar. Their leader, Goran'Agar (Scott MacDonald), takes the two captive before asking Bashir to help cure his men of their addiction to ketracel-white, the drug that makes them loyal to the Founders of the Dominion. Goran'Agar was stranded on the planet four years prior and expected to die when he ran out of his supply of the drug, but he survived and has since never needed it; he concluded that there must be some substance on the planet that cured him of his addiction. Bashir is sceptical since the entire genetic structure of the Jem'Hadar had been reconfigured to be dependent on the drug, and the two officers initially cook up a plan to escape, but O'Brien's makeshift weapon is discovered. However, while the Jem'Hadar that still use the drug frequently suggest killing the men for their disobedience, Bashir notes that Goran'Agar shows unusual mercy, and his conversations seem to indicate independence of thought and character. He begins to understand Goran'Agar and decides he wants to aid him and his men, but O'Brien is convinced the Jem'Hadar will always be brutal killers regardless of whether they are dependent on the drug or not; they reach an impasse, and Bashir as the superior officer orders O'Brien to help him develop a cure by retrieving a piece of equipment from the runabout.

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