The Nemours Estate is a 200-acre (81 ha) country estate with jardin à la française formal gardens and a French neoclassical mansion in Wilmington, Delaware, United States. Built to resemble a French château, its 105 rooms on four floors occupy nearly 47,000 sq ft (4,400 m2). It shares the grounds at 1600 Rockland Road with the Nemours Children's Hospital, Delaware, and both are owned by the Nemours Foundation.

Carrère and Hastings, the firm of John Merven Carrère and Thomas Hastings, was an American architecture firm specializing in Beaux-Arts architecture. Located in New York City, the firm practiced from 1885 until 1929, although Hastings practiced alone after Carrère died in an automobile accident in 1911.