Doctor of Medicine (MD or DM), or in , meaning "Teacher of Medicine", is a terminal degree for physicians and surgeons. In countries that follow the tradition of the United States, it is a first professional graduate degree awarded upon graduation from medical school. In countries that follow the tradition of the United Kingdom, the title of the equivalent medical degree is instead styled as Bachelor of Medicine, Bachelor of Surgery. In those countries, the MD may either be: (1) a research doctorate, akin to the Doctor of Philosophy (PhD); (2) an advanced clinical coursework degree, akin to the Master of Surgery; or (3) an honorary or higher doctorate reserved for medical graduates.

MD, Md, mD or md may stand for:

• Doctor of Medicine, from the Latin Medicinae Doctor (MD)
• Mean difference, a measure of statistical dispersion
• Md, the symbol for the chemical element Mendelevium
• Mesoscale Discussion, a short-term technical meteorological forecast concerning convection (MCD) or precipitation (MPD)
• Methyldichloroarsine, a blister agent used in chemical warfare
• Millidarcy (mD), one thousandth of a darcy, a unit of fluid permeability
• Molecular dynamics, a method of computer simulation of molecular interaction
• Muscular dystrophy, a genetic and hereditary muscle disease
• Medial dorsal nucleus, a large nucleus in the thalamus

Doctor of Medicine (MD or DM), or in , meaning "Teacher of Medicine", is a terminal degree for physicians and surgeons. In countries that follow the tradition of the United States, it is a first professional graduate degree awarded upon graduation from medical school. In countries that follow the tradition of the United Kingdom, the title of the equivalent medical degree is instead styled as Bachelor of Medicine, Bachelor of Surgery. In those countries, the MD may either be: (1) a research doctorate, akin to the Doctor of Philosophy (PhD); (2) an advanced clinical coursework degree, akin to the Master of Surgery; or (3) an honorary or higher doctorate reserved for medical graduates.

MD, Md, mD or md may stand for:

• Doctor of Medicine, from the Latin Medicinae Doctor (MD)
• Mean difference, a measure of statistical dispersion
• Md, the symbol for the chemical element Mendelevium
• Mesoscale Discussion, a short-term technical meteorological forecast concerning convection (MCD) or precipitation (MPD)
• Methyldichloroarsine, a blister agent used in chemical warfare
• Millidarcy (mD), one thousandth of a darcy, a unit of fluid permeability
• Molecular dynamics, a method of computer simulation of molecular interaction
• Muscular dystrophy, a genetic and hereditary muscle disease
• Medial dorsal nucleus, a large nucleus in the thalamus