• A treaty in 1857 whereby a group of shipping nations bought out the Sound Dues in the Øresund
• A bidding convention
  Bridge convention
  A bridge convention is a system of calls made during the auction phase of a contract bridge game which conveys a coded meaning about the players' card holdings...
  
   used in bridge
  Contract bridge
  Contract bridge, usually known simply as bridge, is a trick-taking card game using a standard deck of 52 playing cards played by four players in two competing partnerships with partners sitting opposite each other around a small table...
  
  ; see Copenhagen convention (bridge)
  Copenhagen convention (bridge)
  The Copenhagen convention is a conventional overcall which shows a two-suited hand. It was first devised by Mr. John Trelde and Mr. Gert Lenk, both of Copenhagen, Denmark...
  
  
• United Nations Climate Change Conference 2009, a conference being held in Copenhagen regarding climate change mitigation

See also

• Treaty of Copenhagen (disambiguation)
• Treaty of Copenhagen (1660)
• Treaty of Copenhagen (1441)
  Treaty of Copenhagen (1441)
  The Treaty of Copenhagen was signed in 1441 between the Hanseatic League and the Netherlands, ending the Dutch-Hanseatic War....