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Orn or ORN may refer to:
- Orn (name)
- Orn, a 1970 novel by Piers Anthony.
- 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 radiation therapy where a section of bone dies.
| disambiguation page lists articles associated with the title Orn.
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