The Cagliari Observatory (Italian: Osservatorio Astronomico di Cagliari, or OAC) is an astronomical observatory owned and operated by Italy's Istituto Nazionale di Astrofisica (National Institute for Astrophysics, INAF). It is located 20 km away from Cagliari in Sardinia. It was founded in 1899 to study the Earth's rotation.

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Cagliari Observatory

Alternative names	OAC
Organization	National Institute for Astrophysics
Location	Cagliari, Metropolitan City of Cagliari, Sardinia, Italy
Coordinates	39°16′55″N 9°07′53″E
Website	www.oa-cagliari.inaf.it
Telescopes	Sardinia Radio Telescope
Location of Cagliari Observatory
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• List of astronomical observatories