The European Parliament election of 1999 took place on 13 June 1999. The Valdostan Union was by far the most voted party in Aosta Valley.
| Party | votes | votes (%) | |
|---|---|---|---|
| Valdostan Union–others | 27,811 | 45.9 | |
| Forza Italia | 10,650 | 17.6 | |
| Bonino List | 5,365 | 8.9 | |
| Democrats of the Left | 4,516 | 7.5 | |
| Segni Pact – National Alliance | 2,271 | 3.8 | |
| The Democrats | 1,902 | 3.1 | |
| Communist Refoundation Party | 1,670 | 2.8 | |
| Federation of the Greens | 1,585 | 2.6 | |
| Lega Nord | 1,178 | 2.0 | |
| Italian People's Party | 751 | 1.2 | |
| Party of Italian Communists | 656 | 1.1 | |
| Others | 2,203 | 3.6 | |
| Total | 60,558 | 100.0 |