Osian or Osiyan may refer to:
- Osian art fund, an arts fund started in Mumbai (2010).
- Osian, Jodhpur, a city in Rajasthan, India
- Osiyan, Unnao, a village in Unnao district, Uttar Pradesh, India
- Osian (name), a name common in Wales, derived from the Irish Oisín
- OSIAN, an Open Source IPv6 Automation Network for wireless sensors
- Asii, also known as the Osians, an ancient central Asian tribe