奥西达（意大利语：Osidda），是意大利努奥罗省的一个市镇。总面积25.78平方公里，人口258人，人口密度10.0人/平方公里（2009年）。ISTAT代码为091068。

Osidda (Sardinian:Osidde) is a comune (municipality) in the Province of Nuoro in the Italian region Sardinia, located about 140 kilometres (87 mi) north of Cagliari and about 25 kilometres (16 mi) northwest of Nuoro. As of 31 December 2004, it had a population of 276 and an area of 25.8 square kilometres (10.0 sq mi).