orn

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Orn or ORN may refer to:

• Orn (name), a given name and surname
• Orn, the second book in Piers Anthony's trilogy Of Man and Manta
• Offshoring Research Network, an international network researching the offshoring of business processes and services
• Olfactory receptor neuron, a type of cell in the nasal mucosa that transduces the presence of odorant molecules into a neural signal
• Olympic route network, a network of dedicated roads linking venues and other key sites in the host city during Olympic games
• Oran Es Sénia Airport (IATA code), an international airport in Es Sénia, Algeria
• Ornithine, an amino acid that plays a role in the urea cycle
• Osteoradionecrosis, a complication of radiation therapy where a section of bone dies