The 2005 provincial elections of Sardinia took place on 8–9 May 2005.
All the Provinces of Sardinia, including the newly established ones (Olbia-Tempio, Medio Campidano, Ogliastra and Carbonia-Iglesias), elected their Presidents and Provincial Councils. A run-off was needed in Olbia-Tempio and took place two weeks later. The elections saw a big victory for the centre-left, which won seven provinces out of eight.
|- !align=left rowspan=2 valign=center bgcolor="#E9E9E9"|!colspan="3" align="center" valign=top bgcolor="lightblue"|House of Freedoms!colspan="3" align="center" valign=top bgcolor="pink"|The Union!colspan="3" align="center" valign=top bgcolor="lightgreen"|Independence Republic of Sardinia!colspan="1" align="center" valign=top bgcolor="#E9E9E9"|Others|-|align="left" bgcolor="lightblue"|candidate|align="center" bgcolor="lightblue"|1st round|align="center" bgcolor="lightblue"|2nd round|align="left" bgcolor="pink"|candidate|align="center" bgcolor="pink"|1st round|align="center" bgcolor="pink"|2nd round|align="left" bgcolor="lightgreen"|candidate|align="center" bgcolor="lightgreen"|1st round|align="center" bgcolor="lightgreen"|2nd round|align="center" bgcolor="#E9E9E9"|1st round|-|align="left" valign=top bgcolor="#E9E9E9" |Cagliari|align="left" valign=top bgcolor="lightblue"|Mariano Delogu
(National Alliance)|align="center" valign=top bgcolor="lightblue"|51.8%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Graziano Milia
(Democrats of the Left)|align="center" valign=top bgcolor="pink"|44.2%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|Elisabetta Pitzurra
(IRS)|align="center" valign=top bgcolor="lightgreen"|0.8%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|3.2%|-|align="left" valign=top bgcolor="#E9E9E9" |Carbonia-Iglesias|align="left" valign=top bgcolor="lightblue"|Antonio Macciò
(Union of Christian Democrats)|align="center" valign=top bgcolor="lightblue"|39.5%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Pierfranco Gaviano
(Democracy is Freedom)|align="center" valign=top bgcolor="pink"|54.9%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|Giovannino Sedda
(IRS)|align="center" valign=top bgcolor="lightgreen"|0.9%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|4.7%|-|align="left" valign=top bgcolor="#E9E9E9" |Medio Campidano|align="left" valign=top bgcolor="lightblue"|Francesco Atzori
(Forza Italia)|align="center" valign=top bgcolor="lightblue"|24.4%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Fulvio Tocco
(Democrats of the Left)|align="center" valign=top bgcolor="pink"|67.2%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|Francesco Sedda
(IRS)|align="center" valign=top bgcolor="lightgreen"|1.4%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|7.0%|-|align="left" valign=top bgcolor="#E9E9E9" |Nuoro|align="left" valign=top bgcolor="lightblue"|Silvestro Ladu
(Fortza Paris)|align="center" valign=top bgcolor="lightblue"|29.2%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Roberto Deriu
(Democracy is Freedom)|align="center" valign=top bgcolor="pink"|60.4%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|Pasqualina Soro
(IRS)|align="center" valign=top bgcolor="lightgreen"|1.4%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|9.0%|-|align="left" valign=top bgcolor="#E9E9E9" |Ogliastra|align="left" valign=top bgcolor="lightblue"|Attilio Murru
(Forza Italia)|align="center" valign=top bgcolor="lightblue"|34.1%|align="center" valign=top bgcolor="lightblue"||align="left" valign=top bgcolor="pink"|Pier Luigi Carta
(Democratic Socialists)|align="center" valign=top bgcolor="pink"|59.9%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|6.0%|-|align="left" valign=top bgcolor="#E9E9E9" |Olbia-Tempio|align="left" valign=top bgcolor="lightblue"|Livio Fideli
(Forza Italia)|align="center" valign=top bgcolor="lightblue"|46.5%|align="center" valign=top bgcolor="lightblue"|48.6%|align="left" valign=top bgcolor="pink"|Anna Murrighile
(Sardinia Project)|align="center" valign=top bgcolor="pink"|46.8%|align="center" valign=top bgcolor="pink"|51.9%|align="left" valign=top bgcolor="lightgreen"|Giovanni Pala
(IRS)|align="center" valign=top bgcolor="lightgreen"|1.4%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|5.3%|-|align="left" valign=top bgcolor="#E9E9E9" |Oristano|align="left" valign=top bgcolor="lightblue"|Pasquale Onida
(Fortza Paris)|align="center" valign=top bgcolor="lightblue"|52.4%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Silvano Cadoni
(Sardinian Action Party)|align="center" valign=top bgcolor="pink"|45.0%|align="center" valign=top bgcolor="pink"|-|align="left" valign=top bgcolor="lightgreen"|Francesco Sanna
(IRS)|align="center" valign=top bgcolor="lightgreen"|1.9%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|0.7%|-|align="left" valign=top bgcolor="#E9E9E9" |Sassari|align="left" valign=top bgcolor="lightblue"|Stefano Poddighe
(Sardinian Reformers)|align="center" valign=top bgcolor="lightblue"|32.7%|align="center" valign=top bgcolor="lightblue"|-|align="left" valign=top bgcolor="pink"|Alessandra Giudici
(Democracy is Freedom)|align="center" valign=top bgcolor="pink"|60.7%|align="center" valign=top bgcolor="pink"||align="left" valign=top bgcolor="lightgreen"|Gavino Sale
(IRS)|align="center" valign=top bgcolor="lightgreen"|4.1%|align="center" valign=top bgcolor="lightgreen"|-|align="center" valign=top bgcolor="#E9E9E9"|2.5%|}Source: Ministry of the Interior
| Province | AN | FI | FP | UDS | RS | UDC | UDEUR | DL | PS | SDI | DS | PdCI | PRC | PSdAz | SN | IRS | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cagliari | 8.0 | 11.2 | 3.8 | - | 9.1 | 9.0 | 3.5 | 9.6 | 3.5 | 3.9 | 14.7 | 2.8 | 5.8 | 4.7 | 0.9 | 0.8 | |
| Carbonia-Iglesias | 4.2 | 8.6 | 1.0 | 4.3 | 6.2 | 17.3 | 3.0 | 9.3 | 3.5 | 6.5 | 18.0 | 2.6 | 6.3 | 4.2 | 0.4 | 0.9 | |
| Medio Campidano | 7.8 | 6.0 | - | - | 3.8 | 4.6 | 5.9 | 11.6 | 5.3 | 4.3 | 23.3 | 3.3 | 6.1 | 4.4 | - | 1.4 | |
| Nuoro | 5.4 | 4.5 | 8.0 | - | 3.4 | 7.0 | - | 14.1 | 7.4 | 9.5 | 17.7 | 4.6 | 6.5 | 7.1 | 2.0 | 1.4 | |
| Ogliastra | 3.6 | 10.4 | 4.8 | 4.9 | - | 6.7 | 5.4 | 14.1 | 4.0 | 8.2 | 15.8 | 3.1 | 4.5 | 5.8 | - | - | |
| Olbia-Tempio | 10.3 | 15.4 | 3.7 | - | 4.0 | 10.4 | 7.8 | 12.6 | 8.2 | - | 13.8 | - | - | 3.9 | 0.9 | 1.3 | |
| Oristano | 8.4 | 7.6 | 11.4 | 7.4 | 7.1 | 10.0 | - | 11.4 | 4.2 | 4.6 | 12.3 | - | 4.7 | 7.2 | 0.6 | 1.8 | |
| Sassari | 7.8 | 12.6 | 2.0 | - | 1.8 | 4.0 | 9.3 | 10.8 | 5.5 | 5.4 | 13.2 | 1.7 | 5.1 | 6.6 | 1.3 | 3.7 |