New Sweden was a Swedish colony that existed along the Delaware River Valley from 1638 to 1655 and encompassed land in present-day Delaware, southern New Jersey, and southeastern Pennsylvania. The several hundred settlers were centered around the capital of Fort Christina, at the location of what is today the city of Wilmington, Delaware. The colony also had settlements near the present-day location of Salem, New Jersey (Fort Nya Elfsborg) and on Tinicum Island, Pennsylvania. The colony was captured by the Dutch in 1655 and merged into New Netherland, with most of the colonists remaining. Years later, the entire New Netherland colony was incorporated into England's colonial holdings.

The colony of New Sweden introduced Lutheranism to America in the form of some of the continent's oldest European churches. The colonists also introduced the log cabin to America, and numerous rivers, towns, and families in the lower Delaware River Valley region derive their names from the Swedes. The Nothnagle Log House in present-day Gibbstown, New Jersey, was constructed in the late 1630s during the time of the New Sweden colony. It remains the oldest European-built house in New Jersey and is believed to be one of the oldest surviving log houses in the United States.