The province of Cagliari (; ) was a province in the autonomous island region of Sardinia, Italy. Its capital city was Cagliari.
It had an area of , and a total population of 543,310 (2001). There were 71 comuni (: comune) in the province https://web.archive.org/web/20070807094512/http://www.upinet.it/indicatore.asp?id_statistiche=6.
The historical province was suppressed by the 2016 Regional Decree Province of Cagliari and replaced by the Metropolitan City of Cagliari and by the province of South Sardinia. However, with the disestablishment of South Sardinia and the formation of the provinces of Sulcis Iglesiente and Medio Campidano, the Metropolitan City was effectively restored to the borders of the old Province.
The valley of Piscinamanna is in the province.
As of June 30, 2005, the major comuni (municipalities) by population was:
The Democratic Party (, PD) is a social-democratic political party in Italy, with The People of Freedom (, PdL), it is one of the two major parties of the current Italian party system.