The Doctor, an Emergency Medical Hologram, is a fictional character portrayed by actor Robert Picardo on the television series Star Trek: Voyager, which aired on UPN between 1995 and 2001. He is an artificial intelligence manifesting as a holographic projection, designed to act as a short-term supplement to the medical staff of a starship during emergency situations. However, when the starship Voyager is stranded on the far side of the galaxy with no surviving medical personnel, he is forced to act as the ship's chief medical officer for several years. In an example of the Star Trek franchise's exploration of artificial intelligence, a simple software program becomes a major character in the show.

Robert Alphonse Picardo is an American actor. He is best known for playing the Cowboy in Innerspace, Coach Cutlip on The Wonder Years, Captain Dick Richard on the ABC series China Beach, the Doctor on Star Trek: Voyager and Richard Woolsey in the Stargate franchise. He is a frequent collaborator of Joe Dante and is a member of The Planetary Society's Board of Directors.