Visiting the Club

Dining Upstairs - Warren Ballroom

Visiting the Club

Please make note of the following house rules when you are visiting the Cosmos Club. If you have questions, contact the Front Desk at 202-387-7783 or


The Clubhouse is open to members and their guests and members of reciprocal clubs daily from 7:00 am to 11:00 pm.

Dress Code

Gentlemen are expected to wear jackets, dress slacks, a collared long-sleeved shirt (tucked-in) or turtleneck at all times. Ties are required only in the Garden Dining Room at Sunday brunch, and at lunch and dinner. Ties are not required anywhere else in the clubhouse. Ladies are expected to dress in an equivalent fashion, which means dresses, suits, skirts or dress slacks with jackets or tops of equivalent formality. Learn more…


District of Columbia law prohibits smoking within the entire building. Smoking is permitted in the East Garden.

Electronic Devices

The use of portable electronic devices is allowed in silent mode anywhere in the Clubhouse; laptop computers may be used in the Library, the Magazine Room, the Writers Room, the Business Center, and the Club Room. Members and guests wishing to use a voice device should ask a staff member for directions to an appropriate room.


Club employees understand that gratuities of any kind must be refused. Contributions to the Holiday Fund are welcome at any time, as are written commendation that may be a part of an employee's record.

Display of Paperwork

While discussing Club or personal matters, a moderate amount of paperwork may be displayed in the Garden Dining Room during breakfast hours; in the Garden Bar or the 1878 Grille (formerly Heroy and Smith Rooms) during luncheon hours, and at any time in the Club Room or East Garden. If more than a modest amount of paperwork is to be displayed, members should reserve a private meeting room No paperwork may be displayed in any portion of the Club's dining areas during dinner hours.