| Election Name: | 2004 French Senate election |
| Country: | France |
| Type: | parliamentary |
| Ongoing: | no |
| Previous Election: | 2001 French Senate election |
| Previous Year: | 2001 |
| Next Election: | 2008 French Senate election |
| Next Year: | 2008 |
| Seats For Election: | A third of seats (117) to the French Senate |
| Election Date: | September 26, 2004 |
| Leader1: | Josselin de Rohan |
| Party1: | Union for a Popular Movement |
| Leaders Seat1: | Morbihan |
| Last Election1: | 162 |
| Seats1: | 155 |
| Seat Change1: | 7 |
| Leader2: | Jean-Pierre Bel |
| Party2: | Socialist Party (France) |
| Leaders Seat2: | Ariège |
| Last Election2: | 83 |
| Seats2: | 97 |
| Seat Change2: | 14 |
| Leader3: | Michel Mercier |
| Party3: | Union for French Democracy |
| Leaders Seat3: | Rhône |
| Last Election3: | 31 |
| Seats3: | 33 |
| Seat Change3: | 2 |
| President of the Senate | |
| Before Election: | Christian Poncelet |
| Before Party: | Union for a Popular Movement |
| After Election: | Christian Poncelet |
| After Party: | Union for a Popular Movement |
Following the end of the 9-year terms of 127 "series C" senators, indirect senatorial elections were held in France on September 26, 2004.
This was the last renewal of serie C senators- following the electoral reform, senators are not elected by thirds to nine-year terms but by halves to six-year terms.
Since 2001, 10 seats had been added to Senate. This election elected Senators from 28 departments on the mainland (115 seats including 107 incumbents and 8 new seats), 2 from Guadeloupe and Martinique (5 seats including 4 incumbents and one new seat), 2 from overseas territories, Mayotte and Saint-Pierre-et-Miquelon (3 seats including 2 incumbents and one new seat), and 4 senators representing French citizens abroad.
The 117 incumbents were divided in the following way:
| Group | Seats (2001) | Seats (2004) | Change | ||
|---|---|---|---|---|---|
| UMP Group | 162 | 155 | –7 | ||
| Socialist Group | 83 | 97 | +14 | ||
| Centrist Union - UDF Group | 31 | 33 | +2 | ||
| Communist, Republican and Citizen Group | 23 | 23 | ±0 | ||
| Democratic, Social, and European Rally | 17 | 16 | –1 | ||
| Non-Inscrits | 5 | 7 | +2 | ||
| Total: | 321 | 326 | +5 | ||