| Map: | Chile |
| Coordinates: | -51°N -114°W |
| Waterbody: | Pacific Ocean |
| Area Km2: | 812 |
| Highest Mount: | 1158 |
| Country: | Chile |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions: | Magallanes |
| Country Admin Divisions Title 1: | Province |
| Country Admin Divisions Title 2: | Commune |
| Additional Info: | NGA UFI=-884011 |
Hanover Island (Spanish: Isla Hanover) is an island in the Magallanes Region. It is separated from the Chatham Island by the Esteban Channel, Guías Narrows and Inocentes Channel.
In popular fiction, a fictionalized version of the island is featured in Jules Verne's book Two Years' Vacation. The book tells the story of 15 boys (aged between 8 and 14) from Auckland, New Zealand, who spent two years on this remote island as a result of a storm, which cast their schooner upon the island's shore. There it is called "Chairman Island" after the name of the boys' boarding school.
The Torres del Paine National Park is located on the continental side.