Goose Island is a small, uninhabited rocky island (technically an islet) off of the coast of Connecticut, in Long Island Sound. It belongs to the town of Guilford. It is near Falkner Island, North Rocks, Falkner Island Reef, Stony Island, and Three Quarters Rock. Goose Island has eroded to the point that it is 0.5 acre and virtually underwater at high tide, although it was once about 4 acres in size.  The strait between the two islands is between 16 and 8 feet deep.   The coastline is defined prominently by two small bays that connect during high tide.
The island is currently privately owned, but may someday become part of the Stewart B. McKinney National Wildlife Refuge.
In 1858, a coal schooner named Moses F. Webb crashed on the island. The crew of five was saved by Brooks. He later was given a medal, silver set, salary raise, and was nicknamed the "Hero of 1858".
Due to the circumstances, there are few plants and animals that are permanent residents. Those that do are mostly hardy plants, algae, and lichens. The island was named for the many birds, particularly geese, that often roost here.