| Théâtre de l'Île | |
| Former Names: | Hull Water Works (1886–1974) |
| Address: | 1, rue Wellington Gatineau, Quebec J8X 2H3 |
| Coordinates: | 45.4255°N -75.7247°W |
| Owner: | Ville de Gatineau |
| Capacity: | 119 |
| Type: | Theatre |
| Opened: | January 11, 1974 |
| Yearsactive: | 1974–present |
| Built: | 1886 |
The Théâtre de l'Île (Theatre of the Island) is a small municipally run theatre in Gatineau, Quebec, Canada. It is located on a small island at the southern end of the Ruisseau de la Brasserie, a small river running just to the west of Montcalm Street in the former city of Hull. The building was originally constructed in 1886 as the Hull Water Works, at a time when the site was at the heart of a largely industrial area. In the subsequent decades the building served a number of different purposes. In 1974, it suffered a devastating fire. The city of Hull and the National Capital Commission joined together to rebuild the structure as a theatre. It opened in 1976, and was the first municipally run theatre in Quebec.
The theatre seats up to 119. It puts on a number of different shows per year, with some 25,000 spectators per annum.