Doctor may refer to any of the following:
- Dr. Kekeru Goyu, a doctor who did not take proper care of his patients or staff below him.
- Dr. Richard Goat, a surgeon, who competed in the Grand Championship.
- Yu-Gi-Oh! GX
- Dr. Vellian Crowler, Head professor and department chair of techniques at Duel Academy.
- Wheeler's doctor, a doctor in an animal Dueling learning program
- Dr. Eisenstein, a ten time Nobel award-winning German physicist, specialized in Duel physics
- Doctor Collector, a highly intelligent Pro League Duelist
- Yu-Gi-Oh! 5D's
- Dr. Fudo, a developer at R.R.D. and Yusei Fudo's father
- Mrs. Fudo, Yusei Fudo's mother, who is also a doctor
- Dr. Schmidt, a doctor, who worked with Martha.
- Haluna's doctor, a doctor at Domino General Hospital.
- Doctor (Puzzle Hospital), a doctor at Puzzle Hospital.
- Yu-Gi-Oh! ARC-V
- Cyborg Doctor
- Doctor Cranium
- Genex Doctor
- Grand Tiki Elder (Masked Witch Doctor - Cursed Gyura)
- Witch Doctor of Chaos
- Witch Doctor of Sparta
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