Starfleet casualties (24th century)
Federation Starfleet personnel in the 24th 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-C) 
The following casualties served aboard the  while it was in service (2344):

In addition to those listed below: 
Unknown number of crewmembers killed in battle with the Romulans at Narendra III

{{bginfo|The only known survivor of the 125 crewmembers that returned to Narendra III was Natasha Yar, though other members of the crew, including those listed as KIA, may have survived as Romulan prisoners of war. ()}}

 USS Enterprise (NCC-1701-D) 
The following casualties served aboard the  while it was in service (2363 – 2371):

In addition to those listed below:
Eighteen personnel in a stolen hull section were killed or assimilated by the Borg when Q sent the ship to System J-25 (2365, )
Three crewmembers killed by Ansata terrorists (2366, )
Eleven crewmembers were killed, and eight were missing, when a Borg cutting beam caused a hull breach in the engineering section (2366, )
Ensign Keller died during a containment breach in the warp core (between 2366 and 2368, )
Fang-lee killed in action (sometime prior to 2368, )
Eight crewmembers were lost in the fire storms on Bersallis III (2369, )
There were "light" casualties in the battle above, and subsequent crash on Veridian III (2371, )

Revivals

 USS Enterprise (NCC-1701-E)
The following casualties served aboard the  between 2372 – 2379:

In addition to those listed below:
Many unknown crewmembers were assimilated by the Borg during the trip back to 2063 ()
Several of the crew died during the Battle in the Bassen Rift with the Scimitar in 2379 ()

Deep Space 9, USS Defiant (NX-74205), USS Sao Paulo (NCC-75633)
The following casualties served aboard either Deep Space 9 between 2369 – 2376, the  while it was in service (2371 – 2375), or the , renamed Defiant, in 2376:The Defiants, along with the runabouts, were crewed by personnel stationed at DS9, as the ships were designated as support craft for the station and as such had no permanently assigned crew. Casualties marked as Defiant were sustained when on assignment to that vessel, casualties marked as Sao Paulo are for the second Defiant, while casualties on runabouts are marked as DS9.In addition to those listed below:
At least three unnamed crewmembers were killed during the Klingon attack on the station in 2372. (Deep Space 9, KIA, )
Several unnamed security officers killed on Vandros IV by rebel Jem'Hadar in 2372. (Defiant, KIA, )
Three unnamed crewmembers were killed during Battle of Cardassia in 2376. (Sao Paulo, KIA, )See also: Bajoran Militia casualties.See also: Mirror universe casualties.USS Exeter (NCC-26531) 
The following casualties served aboard  in 2374: 

Captain  (KIA)
Lieutenant Commander  (MIA)
Admiral  (MIA)
Commander  (WIA)
Nurse  (KIA)
 Captain  (KIA)

USS Valiant (NCC-74210)
The following casualties served aboard  while it was in service (2372 – 2374): 

In addition to those listed below: 
Thirty unnamed Red Squad crewmembers were killed in the destruction of the Valiant.

AR-558
In addition to those listed below:Most of the 150 crewpeople died in the five months the contingent was under siege at AR-558 in 2375.USS Voyager (NCC-74656) 
The following casualties served aboard  while it was in the Delta Quadrant (2371 – 2378):

In addition to those listed above:
Several crewmembers were killed when the  pulled Voyager into the Delta Quadrant, including the chief engineer, the transporter chief, astrogation department, and the entire medical staff. (KIA 2371, )
Two crewmembers were killed during Kazon attacks. (KIA 2371-2372, )
At least one person was killed during the Hirogen takeover of Voyager. (KIA 2374, )
Three crewmembers killed in engineering during a Kyrian assault on Voyager (KIA, )
At least three unnamed casualties due to the nucleogenic lifeforms' attack on Voyager (KIA 2376, )

UnknownSee casualty report.Commander  (KIA)
Ensign  (KIA)
Technician  (KIA)
Lieutenant  (KIA)
Lieutenant Commander  (KIA)
Lieutenant  (KIA)
Ensign  (KIA)
Lieutenant Commander  (KIA)

Three engineering crewmembers were killed by Kyrian intruders (KIA, )

Revivals
In addition to those listed below:
Quinn accidentally made the entire male complement of Voyager disappear, until Q restored them. (2372, )

USS Prometheus
The following casualties served aboard  while it still was as a prototype in service (2374). The entire crew was killed by Romulans.

USS Equinox 
The following casualties served aboard  while it was in service (2370 – 2376): 

In addition to those listed below: 
Encounters with the Krowtonan Guard in 2371 resulted in thirty-nine losses, or half the crew.Less then a third of Equinox crew survived the years in the Delta Quadrant before Voyager discovered them in 2376. ()

USS Cerritos
The following casualties served aboard  while it was in service (2380):

Other posts

Unknown
Ghorusda Disaster
Captain Darson (, KIA)
47 people from the Adelphi were killed on Ghorusda, including Darson.
Galen border conflict
219 fatalities over three days.
Federation-Tzenkethi War
Federation-Cardassian War

2311
Tomed Incident

2357
Lieutenant Commander Connor Rossa (Galen IV, KIA)
Many other Starfleet personnel and civilians, including Connor's wife Moira, were killed in the Talarian attack.

2358
 lost.
Seventy-one members of the crew were killed when the ship was lost.

2362
Ensign Marla E. Finn (Utopia Planitia Fleet Yards, KIA)
Lieutenant William Hodges (Utopia Planitia Fleet Yards, KIA)
Lieutenant junior grade Walter Pierce (Utopia Planitia Fleet Yards, KIA)
Setlik III massacre
Raymond Boone killed and replaced by a Cardassian spy.
Will Kayden (KIA)

2364
 destroyed.
All eighty members of the crew were killed.
Onna Karapleedeez (KIA)
 Captain Walker Keel (, KIA)
The entire crew of the Horatio was lost when the power struggle between Captain Keel and officers possessed by parasitic beings destroyed the ship.
McKinney (KIA)
 Lieutenant Commander Dexter Remmick (Starfleet Headquarters, KIA)
 Remmick was the host body for the mother creature of the parasitic beings which infiltrated Starfleet. Numerous other officers were killed as part of the creatures' conspiracy.
Ryan Sipe (KIA)

2365
Commander Steve Gerber (, KIA)
Captain L. Isao Telaka (, KIA)
The entire crew of the Lantree was killed by premature aging.
Captain Donald Varley (USS Yamato, KIA)
Captain Varley's entire crew of over one thousand was killed by the computer failure.
Lieutenant Commander  (USS Yamato, KIA)

2367
Commander Brink (, KIA)
Anthony Brevelle (Starbase 112)
Paul Hickman

Captain Chantal Zaheva (, KIA)
Zaheva's entire crew, save sole survivor Andrus Hagan, were killed by the alien telepathic distress call.
Battle of Wolf 359
J.P. Hanson (KIA)
Eleven thousand killed or assimilated on thirty-nine starships, including: , , , , , , , , , , , , , , and the 

2369
Commander Calvin "Hutch" Hutchinson (KIA)
Joshua Kelly (, KIA)
 The Yosemite was later recovered, but the crew was all listed as MIA except Kelly and four survivors.
Captain Silva La Forge (, MIA)
Captain La Forge's entire crew and ship were reported missing, with no trace ever found of them.
Ohniaka III Research Station destroyed by the Borg.
All 274 crewmembers were killed or assimilated.

2370
 destroyed.
All seven members of the crew were KIA.
Captain Keogh (, KIA)
 The Odyssey was lost with all hands except the non-essential personnel, who were left at Deep Space 9.

2371
Captain Lisa Cusak (, KIA)
Commander Gatsby (USS Olympia, KIA)
The entire crew of Olympia perished in the breakup of their vessel.

2372

Captain Laporin (KIA)
Laporin's Tellarite helmsman (KIA)

2373
 had about two dozen casualties during its battle with the USS Defiant listed as MIA
 listed as MIA
Michael Eddington (Maquis)
Calvin Hudson (Maquis)

Chief  (KIA)
Burke's entire squad died defending Ajilon Prime.
 destroyed
Battle of Sector 001
Around thirty ships destroyed;  reported ninety-six casualties and twenty-two wounded.
Dominion War
Second Battle of Deep Space 9
Battle of Torros III

2374
Vice Admiral Fujisaki (KIA)
Commander Alice K. Ginsburg (Starbase 153, MIA)
Mitchell B. Green (, MIA)
Lieutenant Commander Sandy A. Holst (, MIA)
Lieutenant McConnell (, KIA)
The Honshu was destroyed with almost all hands by a Cardassian attack wing; at least three of the starship's escape pods and a shuttlecraft managed to escape.
Captain Quentin Swofford (, KIA)
Most or all of Captain Swofford's crew were assumed to be lost with their vessel.
 Captain Leslie Wong (, KIA)
Most or all of Captain Wong's crew were assumed to be lost with their vessel.
Dominion War
Battle in the Tyra system
Ninety-eight starships of the Seventh Fleet destroyed
Operation Return
 and  among the destroyed.
Battle of Betazed
First Battle of Chin'toka
Heavy casualties in the Federation / Klingon / Romulan fleet including  and 

2375
Vice Admiral Dougherty (KIA)
Luther Sloan (Section 31, KIA)
Dominion War
Battle of Ricktor Prime
 destroyed; 1,244 crewmembers KIA
Breen attack on Earth
Second Battle of Chin'toka
311 ships destroyed in the combined Federation / Klingon / Romulan fleet.
(The survivors' escape pods were allowed to flee.)
Battle of Cardassia
Approximately four hundred ships were destroyed in the combined Federation / Klingon / Romulan / Cardassian fleet, including an  starship.

Dominion War casualtiesSee casualty report.During the Dominion War, Starfleet's battle-related casualties became so numerous that they were released on a weekly, or even daily, basis. Scrolling the readouts of wounded and killed became a regular activity for Starfleet officers on the front line bases. The names below are excerpted from known lists, received on or around stardate 51721, in 2374, from the starships and starbases:
, , , , , , , , , , , 
Starbase 129, Starbase 153
()

Ensign Rick K. Bittle (KIA)
Captain Margaret C. Clark (MIA)
Lieutenant Barbara P. Covington (KIA)
Lieutenant Curt F. Danhauser (KIA)
Lieutenant junior grade Laura E. Derr (KIA)
Lieutenant Commander Dorothy R. Duder (KIA)
Lieutenant Russ A. English (KIA)
Doctor Terry P. Erdmann (KIA)
Nurse Ann T. Flood (KIA)
Ensign John A. Fredrickson (KIA)
Captain Kurt S. Hansen (MIA)
Nurse Teri T. Hansen (KIA)
Captain Phillip Jacobson (KIA)
Ensign Penny M. Juday (KIA)
Commander Grace K. Kenney (WIA)
Lieutenant Matata L. Kimya (KIA)
Lieutenant Alan M. Kobayashi (KIA)
Ensign Beverly C. Kurts (KIA)
Lieutenant Jay T. Laprade (KIA)
Ensign Paul F. Lawrence (KIA)
Lieutenant Commander Kathy S. Leprich (KIA)
Lester P. LeVesconte (KIA)
Lieutenant junior grade Faith LeVesconte (KIA)
Lieutenant Rose E. Limli (KIA)
Commander Mindy C. Long (KIA)
Ensign Tom P. Mahoney (KIA)
Ensign Marian A. McAllum (KIA)
Nurse Kathy McCammon (KIA)
Lieutenant Commander Jon S. Monson (KIA)
Commander David P. Nemzek (MIA)
Nurse Donna W. Nemzek (KIA)
Ensign Dorit J. Oberman (MIA)
Ensign Lori B. Oberscheven (KIA)
Larry A. Ohlson (KIA)
Nurse Nancy B. Ohlson (KIA)

Alternate timelines and parallel universesSee: alternate timelines and parallel universes.Ensign Nell Chilton of the  (Unknown, )

USS Enterprise (NCC-1701-D)
Energy vortex alternate timeline 
In addition to those listed below:
Entire crew of the  except Jean-Luc Picard. (2365, )

Temporal rift alternate timeline
Commander William T. Riker (2366, )It is likely that many more crewmembers died than just Riker.Temporal casualty loop timelines
Entire crew of the USS Enterprise-D (2368, )The ship was lost with all hands several times before the temporal causality loop was broken. It is likely the  was destroyed as well each time.Quantum fissure timelines
Lieutenant Commander Geordi La Forge (2370, )
Captain Jean-Luc Picard was killed as Locutus of Borg in at least two of these universes. (2367)
At least a William T. Riker and Worf are killed when their Enterprise is destroyed by another Enterprise.
Three entire crews of the USS Enterprise-D (2364/2370/Unknown, )

 Nexus timeline
Entire crew of the USS Enterprise''-D except Jean-Luc Picard. (2371, )

USS Voyager
 Entire crew of the  except Harry Kim and Naomi Wildman. ()
Entire crew of the  except Chakotay and Kim. ()
Entire crew of the . ()
Kathryn Janeway (, , )
Lieutenant jg B'Elanna Torres ()
Commander Chakotay ()
Seven of Nine ()

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