| Tour T1 | |
| Location: | La Défense (Courbevoie) |
| Coordinates: | 48.8961°N 2.2394°W |
| Status: | Complete |
| Start Date: | 2005 |
| Completion Date: | 2008 |
| Opening: | 2008 |
| Building Type: | Office |
| Antenna Spire: | 185m (607feet) |
| Roof: | 169m (554feet) |
| Floor Count: | 37 |
| Floor Area: | 70000sqm[1] |
| Architect: | Valode & Pistre Architects |
Tour T1 (also known as the Tour GDF Suez) is an office skyscraper in La Défense, the high-rise business district west of Paris, France.
Construction began in 2005 and the tower was completed and opened in 2008. The tower, 185 m (607 ft) tall, is the third-tallest skyscraper in La Défense after the Tour Total (190m) and Tour First (231m). Since 2010, the entirety of the building's office space has been rented by GDF Suez.