The European Parliament election of 2004 took place on 12–13 June 2004.
The Olive Tree was the most voted list in Piedmont with 29.0%, followed by Forza Italia (22.1%).
| Party | votes | votes (%) | ||
|---|---|---|---|---|
| The Olive Tree | align=right valign=top | 719,445 | align=right valign=top | 29.0 |
| Forza Italia | 549,250 | 22.1 | ||
| National Alliance | 218,597 | 8.8 | ||
| Lega Nord | 202,925 | 8.2 | ||
| Communist Refoundation Party | 162,987 | 6.6 | ||
| Union of Christian and Centre Democrats | 124,468 | 5.0 | ||
| Bonino List | 77,707 | 3.1 | ||
| Party of Italian Communists | 71,827 | 2.9 | ||
| Federation of the Greens | 59,856 | 2.4 | ||
| Italy of Values–Civil Society–Occhetto | 59,647 | 2.4 | ||
| United Socialists for Europe | 44,194 | 1.8 | ||
| Pensioners' Party | 37,930 | 1.5 | ||
| Social Alternative | 25,076 | 1.0 | ||
| Others | 126,591 | 5.1 | ||
| Total | 2,480,500 | 100.0 |