Ortho is a Greek prefix meaning “straight”, “upright”, “right” or “correct”.

Ortho may refer to:

In science

In mathematics:

In medicine:

  • Orthomyxovirus, a family of viruses to which influenza belongs
  • Orthodontics, a specialty of dentistry concerned with the study and treatment of malocclusions
  • Orthopedic, the study of the musculoskeletal system
  • Ortho-DOT, a psychedelic drug
  • Ortho-cept and Ortho Tri-cyclen, kinds of oral contraceptive drug

In theology:

In business:

See alsoEdit