The Marden House is a residence in McLean, Virginia, USA, designed by the American architect Frank Lloyd Wright. It is located just off Chain Bridge Road and overlooks the Potomac River. Also known as "Fontinalis", it is named after Luis Marden (1913–2003), a writer, photographer and explorer for National Geographic. It was designed by Wright in 1952 and was completed in 1959 at a cost of $76,000.^{[citation needed]}

The location had caught Marden's eye in 1944 when he and his wife and had been fishing along the Potomac. After purchasing a plot of land, Marden continued the correspondence he had maintained with Wright since 1940, asking the architect to design a home for him. It was not until 1952 that the designs finally came.

After Marden moved to a nursing home in 1998, the house was purchased by Jim Kimsey, co-founder of AOL, in 2000 for $2.5 million.