Activities /

Visiting The Club

With a tradition of fellowship, Cosmos Club opens its doors to members, sponsored guests, and reciprocal club guests. We offer overnight accommodation, our premier dining experience, as well as spaces for learning and leisure.

Reciprocal Club Privileges

Cosmos Club provides a warm atmosphere for our cherished guests. Members of reciprocal clubs visiting Washington D.C. are welcome to enjoy our clubhouse and overnight accommodation.

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Dress Code

In respect of tradition, Cosmos Club requires a standard of dress for members and guests of the clubhouse. Our regular dress code is in effect from October 1 through April 30, with business casual attire acceptable during the warmer months (May 1 through September 30). Jeans, denim, t-shirts, athletic clothing and footwear, and hats and baseball caps are never acceptable.


Business casual attire is permitted throughout the clubhouse; however, after 5 pm jackets (but not ties) are required in the dining areas. “Business casual” means collared, long-sleeved, tucked-in shirts that button down the center or turtlenecks and dress slacks for men and comparable attire for women.

Dress Code for Gentlemen

REGULAR DRESS: Gentlemen are expected to wear jackets, dress slacks, and collared, long-sleeved, tucked in shirts that button down the center or turtlenecks. Dining areas require ties during lunch, dinner, and Sunday brunch.  

Dress Code for Ladies

REGULAR DRESS: Ladies are expected to wear dresses, suits, skirts, or dress slacks with jackets or tops of equivalent formality. 

DC Restaurants and Attractions

Visitors of the Club can use the link below to find restaurants within walking distance of the Cosmos Club and in surrounding neighborhoods as well as popular attractions in the nation’s capital.

Visitation Rules & Guidelines

Masks are optional for members, guests, and visitors.

The Cosmos Club permits smoking in the East Garden. In accordance with District of Columbia law, smoking is prohibited within the building.  

Silent use of electronic devices is generally permitted throughout the club except during certain events. Members and guests may not use devices larger than a cell phone in the Garden Dining Room.   

Nonintrusive cell phone conversations are permissible in the Task Center, Writer’s Room, and any third-floor meeting room not in use. Very brief cell phone calls are permissible: 

  • immediately inside the West Garden entrance; 
  • immediately inside the valet parking entrance; 
  • immediately outside the Powell Room’s interior entrance; 
  • in the Gold Room when not in use; and 
  • in the second-floor passageway between the mansion and the annex. 

Cosmos Club employees will refuse gratuities of any kind. Members are welcome to contribute to the Holiday Fund or submit written praise for the employee’s record.

The Cosmos Club values the privacy of the club and its members. When discussing club or personal matters in the Garden Dining Room during breakfast hours, in the Garden Bar or the 1878 Grille during lunch hours, and at any time in the Club Room or East Garden, members may display a moderate amount of paperwork.  

If a discussion requires more than a moderate amount of paperwork, members should reserve a private meeting room. Display of paperwork is prohibited in dining areas during dinner hours.