The winter wren (Troglodytes hiemalis) is a very small North American bird and a member of the mainly New World wren family Troglodytidae. It was once lumped with the Pacific wren (Troglodytes pacificus) of western North America and the Eurasian wren (Troglodytes troglodytes) of Eurasia under the name winter wren.
It breeds in coniferous forests from British Columbia to the Atlantic Ocean. It migrates through and winters across southeastern Canada, the eastern half the United States and (rarely) north-eastern Mexico. Small numbers may be casual in the western United States and Canada.
The scientific name is taken from the Greek word troglodytes (from "trogle" a hole, and "dyein" to creep), meaning "cave-dweller", and refers to its habit of disappearing into cavities or crevices while hunting arthropods or to roost.