Winterthur Museum, Garden & Library

Winterthur Museum, Garden and Library is an American estate and museum in Winterthur, Delaware. As of 2011, it houses one of the most important collections of Americana in the United States of America. It was the former home of Henry Francis du Pont (1880–1969), a renowned antiques collector and horticulturist. Until recently, it was known as the Henry Francis DuPont Winterthur Museum.

The museum has 175 period-room displays and approximately 85,000 objects. Most rooms are open to the public on small, guided tours. The collection spans more than two centuries of American decorative arts, notably from 1640 to 1860, and contains some of the most important pieces of American furniture and fine art. The Winterthur Library includes more than 87,000 volumes and approximately 500,000 manuscripts and images, mostly related to American history, decorative arts, and architecture. The facility also houses extensive conservation, research, and education facilities.

In the 1990s, more informal museum galleries were opened in a new building adjacent to the main house; it features special rotating and permanent exhibits. The museum also is home to the Winterthur Program in American Material Culture and the Winterthur/University of Delaware Art Conservation program.

The museum was named for the Swiss city of Winterthur, the ancestral home of Jacques Antoine Bidermann, a son-in-law of Eleuthère Irénée du Pont, the founder of the du Pont family and fortune in the United States.