OBN may refer to:
- Oban Airport, the IATA code for the airport in Scotland
- OBN, the not-for-profit bioscience business support network in the UK
- Omni Broadcasting Network, a small over-the-air broadcast television network in the United States of America
- Oceania Broadcasting Network, a free-to-air television network in Tonga
- Order of the Brown Nose, a fake honour awarded by Private Eye magazine for published examples of sycophancy
- Televizija OBN, a terrestrial television network in Bosnia-Herzegovina
- Oklahoma Bureau of Narcotics, anti-narcotics agency of Oklahoma
- Ocean Bottom Nightmare, a rock band from Nottingham, England.
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