The Willoughby of Chevy Chase is a high-rise condominium building in Montgomery County, Maryland, on the outskirts of Washington, D.C. When it opened in 1969, it was the largest residential building in the DC area.

It was designed by modernist architect Vlastimil Koubek for Washington developer Milton A. Barlow. But Barlow's firm ran out of funds, and the project's financier, Riggs National Bank, took over.

The building opened in 1969 as the Willoughby Apartments, whose units were luxury rental apartments.

The building changed ownership several times and, ultimately, was sold to First Condominium Development Company of Chicago, specialists in condominium conversions. Apartment sales and control of the condominium were turned over to unit owners in 1982.

There are 815 units including efficiencies, one-, two- and three-bedroom apartments, commercial office space, a convenience store, 701 parking garage spaces, and a restaurant. The building was built with many luxury amenities: an exercise room, 24-hour staffed desk, laundry rooms, library, party room, rooftop lounge, and pool. Bylaws prohibit pets and were recently amended to restrict smoking.

The Willoughby is part of the high-density Village of Friendship Heights census-designated neighborhood in the town of Chevy Chase, Maryland. It is next to Willoughby Park and on the edge of a high-end commercial district.

38°57′44.96″N 77°5′23.34″W / 38.9624889°N 77.0898167°W / 38.9624889; -77.0898167