Federation-Klingon War

There have been multiple wars between the United Federation of Planets and the Klingon Empire. Including;


 * Federation-Klingon War (2256-57) (Star Trek: Discovery)
 * (Star Trek: The Original Series)
 * (Star Trek: Deep Space Nine)
 * Federation-Klingon War (2405-2410) (Star Trek Online)

There was also the created in an alternate timeline by the absence of the USS Enterprise (NCC-1701-C) from the Romulan attack on the Narendra System (see ).