The European Parliament election of 2004 took place on 12–13 June 2004.
The Olive Tree was the most voted list in Trentino, while the South Tyrolean People's Party (SVP) came first as usual in South Tyrol. However the SVP lost many votes to the Greens, which had their best result ever, and to the Union for South Tyrol (UfS).
| Party | votes | votes (%) | ||
|---|---|---|---|---|
| The Olive Tree | align=right valign=top | 93,719 | align=right valign=top | 37.7 |
| Forza Italia | 57,220 | 23.0 | ||
| National Alliance | 16,089 | 6.5 | ||
| Lega Nord | 15,813 | 6.4 | ||
| Union of Christian and Centre Democrats | 11,509 | 4.6 | ||
| South Tyrolean People's Party | 9,505 | 3.8 | ||
| Communist Refoundation Party | 8,816 | 3.6 | ||
| Federation of the Greens | 8,748 | 3.5 | ||
| Bonino List | 6,107 | 2.5 | ||
| Italy of Values–Civil Society–Occhetto | 5,439 | 2.2 | ||
| Pensioners' Party | 3,127 | 1.3 | ||
| Party of Italian Communists | 2,555 | 1.0 | ||
| Others | 9,793 | 3.9 | ||
| Total | 248,440 | 100.0 | ||
| Party | votes | votes (%) | ||
|---|---|---|---|---|
| South Tyrolean People's Party | 117,009 | 46.7 | ||
| The Olive Tree | align=right valign=top | 33,034 | align=right valign=top | 13.2 |
| Greens[1] | 32,799 | 13.1 | ||
| National Alliance | 17,624 | 7.0 | ||
| Forza Italia | 17,192 | 6.7 | ||
| Union for South Tyrol – others | 15,739 | 6.3 | ||
| Bonino List | 2,790 | 1.1 | ||
| Greens Greens | 2,592 | 1.0 | ||
| Communist Refoundation Party | 2,528 | 1.0 | ||
| Others | 9,340 | 3.7 | ||
| Total | 250,647 | 100.0 | ||