Starfleet casualties (23rd century)

Federation Starfleet personnel in the 23rd century often had to place their lives in danger during the course of their duties, and many made the ultimate sacrifice.
 * For non-Starfleet casualties sustained by the Federation, see Civilian casualties.

Posts

 * In alphabetical order by date.

USS Enterprise (NCC-1701)
The following casualties served aboard the USS Enterprise (NCC-1701) while it was in service (2245 – 2285):

Captain Christopher Pike's five-year mission

 * Three crewmembers perished on Rigel VII, including Christopher Pike's personal yeoman, in 2254.

Captain James T. Kirk's five-year mission
In addition to the those listed below:
 * Nine perished after contact with the galactic barrier in 2265
 * One crewman killed by the dikironium cloud creature aboard the Enterprise in 2268
 * Three crewmen died of Rigelian fever in 2269
 * See also: Mirror universe casualties

Following 2270s refit
In addition to those listed below:
 * One security guard killed by V'Ger in 2272
 * The Enterprise took high casualties in 2285 during the Battle of the Mutara Nebula with Khan Noonien Singh.

Other posts
In addition to, and including, those listed above:

2217
 * USS Valiant listed as MIS (Missing In Space).

2257
 * USS Farragut (23rd century) suffered nearly two hundred deaths to a dikironium cloud creature.

2266
 * Twenty died aboard the Antares when the ship was destroyed.
 * One crewmember, however, might have survived.


 * Neutral Zone Incursion
 * Outpost 2 destroyed with all hands by the Romulans.
 * Outpost 3 destroyed with all hands by the Romulans.
 * Outpost 4 destroyed with all hands by the Romulans.
 * Outpost 8 destroyed with all hands by the Romulans.

2267
 * The entire crew of the USS Constellation (NCC-1017) (approximately 430) killed when the planet killer destroyed the planet L-374 III.
 * The entire Starfleet contingent stationed on the Cestus III colony – save sole survivor Lieutenant Harold – was killed by the Gorn, along with the colony's population.

2268
 * The entire crew of the USS Intrepid (NCC-1631) died when the ship encountered a giant spacefaring amoeba.
 * The entire crew of the USS Excalibur (NCC-1664) died when the M-5 computer assaulted the ship.
 * The entire crew of the USS Exeter (NCC-1672), except for Captain Ronald Tracey, died from a bacterial disease at Omega IV.
 * The entire crew of the USS Defiant (NCC-1764) died when the ship was trapped in spatial interphase in Tholian space.

2272
 * The entire staff of Epsilon IX station died in V'Ger's attack.

2285
 * The entire crew of the USS Grissom (NCC-638) died when the ship was destroyed at the Genesis Planet, except for Lt. Saavik.

2294
 * The entire crew, and all passengers, of the USS Jenolan died at the Dyson sphere, except for Captain Scott.

Alternate reality Starfleet casualties
Casualties from the alternate reality created by the Narada. In addition to those listed below:
 * Unknown number of USS Kelvin crewmen killed in the battle with the Narada (2233)
 * Unknown number of USS Enterprise (alternate reality) crewmen killed in the battle with the Narada (2258)
 * The entire crews of the USS Armstrong (NCC-1769), USS Antares, USS Farragut (alternate reality), USS Hood (alternate reality), USS Mayflower (NCC-1621), USS Newton, USS Truman (23rd century), and USS Wolcott presumed KIA before the destruction of Vulcan (2258)
 * Unknown number of personnel stationed on the planet who did not escape before its destruction (2258)
 * Unknown number (up to 42) of personnel at the Kelvin Memorial Archive killed in a bombing. (2259)
 * Unknown number of USS Enterprise crewmen killed. (2259)
 * The entire crew of the USS Vengeance and unknown number of Starfleet Headquarters personnel during the ship's crash. (2259)