The 23rd century, defined in the Earth calendar as being from 2200 until 2299, was a period of expansion for the Federation, with humans and other founding species, such as Vulcans, at the forefront of exploration. The long-running conflict with the Klingons, begun in the 22nd century, was a major topic of this century's history, as was the rekindling of tensions with the Romulans. Of particular note were the voyages of the starship Enterprise and the careers of its long-serving command staff under James T. Kirk.
- The notation BCE ("Before Common Era") and CE ("Common Era") are alternative neutral notations for BC ("Before Christ") and AD ("anno Domini"), respectively.
Decades
Major Events
- The "Time barrier" is broken. (TOS: "The Cage")
- The Klingon Empire relinquishes its claim to the Archanis sector. (DS9: "Broken Link")
- The Klingons eradicate the tribble species. (DS9: "Trials and Tribble-ations")
- Cloaking devices are installed aboard Klingon starships such as the IKS Klothos. (DS9: "Once More Unto the Breach")
List of 23rd century productions
- Star Trek: The Original Series
- Star Trek: The Animated Series
- Star Trek Movies:
- DS9: "Trials and Tribble-ations"
- Star Trek Fan Film Series:
- Star Trek Fan Fiction series:
| 22nd century | Timeline 23rd century |
24th century |