Dr. Wellington Yueh is a fictional character in the Dune universe created by Frank Herbert. Yueh is a major character in the landmark novel Dune.

Yueh was a Suk Doctor with Imperial Conditioning, which meant that he was trusted and qualified even enough to tend to the health of the Emperor of the Known Universe. He was, however, corrupted. Yueh spent the last years of his life in the service of House Atreides. Baron Vladimir Harkonnen, in an attempt to destroy House Atreides, kidnapped Yueh's wife and forced Yueh to betray the Atreides.

Wellington Yueh led to the downfall of House Atreides when he disabled the shields to the Atreides Palace on Arrakis allowing the combined forces of the Emperors Sardaukar and the Harkonnens to attack, and he drugged Duke Leto Atreides himself.

Yueh delivered the Duke right into the hands of Baron Vladimir Harkonnen, but retained some loyalty to the Atreides and allowed Jessica Atreides and Paul Atreides to escape by convincing the Baron to dump them in the desert.

Wellington's last act for vengeance was implanting an artificial tooth into Leto's jaw. This tooth was filled with deadly gas that would be released when the jaw clamped down. Wellington's hope was that Leto would be able to bite down on the tooth while the Baron was gloating over his victory and in doing so, kill the Baron. The plan was unsuccessful in killing the Baron but it did kill his Mentat Piter De Vries.

Wellington, upon delivering the Duke to the Harkonnens found out that his wife was already dead, as he already suspected, but he did not have much time to mourn this loss as he was killed almost immediately after his task was complete.

Dr. Yueh went down in history as a famous traitor, joining a multitude of legendary or real traitors such as Judas, Vidkun Quisling, the Fish Speaker Nayla Nycalliste, An Lu Shan of Earth's China and Benedict Arnold of Old Earth's House of Washington. As with Judas, however, some people have always wondered if Yueh was in fact doing a task that however hateful, was needed to move the human race in time and evolution.