| Election Name: | 2005 Piedmentese regional election |
| Country: | Piedmont |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2000 Piedmontese regional election |
| Previous Year: | 2000 |
| Next Election: | 2010 Piedmontese regional election |
| Next Year: | 2010 |
| Seats For Election: | All 60 seats to the Regional Council of Piedmont |
| Election Date: | 3–4 April 2005 |
| Turnout: | 71.38% (0.58%) |
| Leader1: | Mercedes Bresso |
| Party1: | Democrats of the Left |
| Alliance1: | The Union (Italy) |
| Color1: | EF3E3E |
| Last Election1: | 18 seats, 39.5% |
| Seats1: | 38 |
| Seat Change1: | 20 |
| Popular Vote1: | 1,226,355 |
| Percentage1: | 50.9% |
| Swing1: | 11.4% |
| Leader2: | Enzo Ghigo |
| Party2: | Forza Italia |
| Alliance2: | House of Freedoms |
| Color2: | 0A6BE1 |
| Last Election2: | 40 seats, 51.8% |
| Seats2: | 25 |
| Seat Change2: | 15 |
| Popular Vote2: | 1,133,358 |
| Percentage2: | 47.0% |
| Swing2: | 4.8% |
| President | |
| Posttitle: | President-elect |
| Before Election: | Enzo Ghigo |
| Before Party: | FI |
| After Election: | Mercedes Bresso |
| After Party: | DS |
The 2005 Piedmontese regional election took place on 3–4 April 2005. Mercedes Bresso of the Democrats of the Left defeated the incumbent Enzo Ghigo of Forza Italia.
Regional elections in Piedmont were ruled by the Tatarella law, which was approved in 1995 and provided for a mixed electoral system. Four fifths of the regional councilors were elected in provincial constituencies by proportional representation, using the largest remainder method with a Droop quota and open lists, while the residual votes and the unassigned seats were grouped into a single regional constituency, where the whole ratios and the highest remainders were divided with the Hare quota among the provincial party lists; one fifth of the council seats instead was reserved for regional lists and assigned with a majoritarian representation system, in which the leader of the regional list that scored the highest number of votes was elected to the presidency of the region, while the other candidates were elected regional councilors.
A threshold of 3% had been established for the provincial lists, which could still have entered the regional council if the regional list to which they were connected had scored at least 5% of valid votes. The panachage was also allowed; the voter can indicate a candidate for the presidency but prefer a provincial list connected to another candidate.
| Political party or alliance | Constituent lists | Previous result | Candidate | |||
|---|---|---|---|---|---|---|
| Votes (%) | Seats | |||||
| The Union | 17.7 | 9 | Mercedes Bresso | |||
| 7.9 | 3 | |||||
| 5.5 | 2 | |||||
| Federation of the Greens | 2.1 | 1 | ||||
| 2.1 | 1 | |||||
| 1.8 | 1 | |||||
| Others | ||||||
| House of Freedoms | 30.8 | 17 | Enzo Ghigo | |||
| 11.9 | 6 | |||||
| Northern League Piedmont | 7.6 | 3 | ||||
| 4.5 | 2 | |||||
| 0.7 | – | |||||
| 0.4 | – | |||||
| Others | ||||||
| Candidates | Votes | % | Seats | Parties | Votes | % | Seats | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mercedes Bresso | 1,226,355 | 50.91 | 12 | |||||||
| Democrats of the Left | 411,237 | 20.10 | 11 | |||||||
| Democracy is Freedom – The Daisy | 211,457 | 10.34 | 6 | |||||||
| Communist Refoundation Party | 130,776 | 6.39 | 4 | |||||||
| Together for Bresso | 60,314 | 2.95 | 1 | |||||||
| Federation of the Greens | 57,516 | 2.81 | 1 | |||||||
| Party of Italian Communists | 53,359 | 2.61 | 1 | |||||||
| Italian Democratic Socialists | 49,821 | 2.44 | 1 | |||||||
| Italy of Values | 31,016 | 1.52 | 1 | |||||||
| Union of Democrats for Europe | 10,734 | 0.52 | – | |||||||
| Pensioners for Europe | 5,156 | 0.25 | – | |||||||
| Total | 1,021,386 | 49.93 | 26 | |||||||
| Enzo Ghigo | 1,133,358 | 47.05 | 1 | |||||||
| Forza Italia | 457,397 | 22.36 | 11 | |||||||
| National Alliance | 195,318 | 9.55 | 5 | |||||||
| Northern League Piedmont | 173,020 | 8.46 | 4 | |||||||
| Union of Christian and Centre Democrats | 93,872 | 4.59 | 2 | |||||||
| Greens Greens | 23,761 | 1.16 | 1 | |||||||
| Consumers' List | 23.378 | 1.14 | 1 | |||||||
| Socialists and Liberals | 16.944 | 0.83 | – | |||||||
| 11,883 | 0.58 | – | ||||||||
| Total | 995,573 | 48.67 | 24 | |||||||
| Gianfranco Rotondi | 24,813 | 1.03 | – | Democratic Ecologists – Christian Democracy | 14,255 | 0.70 | – | |||
| Lodovico Ellena | 24,454 | 1.02 | – | Social Alternative | 14,515 | 0.71 | – | |||
| Total candidates | 2,408,980 | 100.00 | 13 | Total parties | 2,045,729 | 100.00 | 50 | |||
| Source: Ministry of the Interior – Historical Archive of Elections | ||||||||||