Mirror universe casualties
Inhabitants of the mirror universe that have died.

By Era
Listed in alphabetical order by date.

Terran Empire
The following casualties happened when the Terran Empire was the dominate force:

In addition to those listed below:
 Unknown number of crew members killed in the destruction of the  by a Tholian web. (2155, )
 Unknown number of crew members killed in the destruction of s by the . (2155, )  
 Unknown number of crew members killed in the destruction of an Vulcan rebel cruiser by the . (2155, ) 
 Unknown number of crew members killed in the destruction of the  by the . (2155, )

Klingon-Cardassian Alliance
The following casualties occurred when the Klingon-Cardassian Alliance was the dominant force:

Appendices

Background information 
The DS9 mirror universe episodes had a high body count of familiar characters who were killed off. This was such a frequent occurrence that it became a standing joke with the writers. Robert Hewitt Wolfe observed, "As of ['Through the Looking Glass'], we'd lost Rom, Sisko, Quark, and Odo. I guess that is pretty bad. We kept saying we'd have to bring people back who we'd killed in our universe so that we could kill them again in the other one." ()

Apocrypha 
List of inhabitants that may be dead:
There have been characters, that while not confirmed, have been strongly suggested to have died.

2155

McKenzie

Unnamed tactical officer on NX-01

2375
Unnamed female rebel on the 
Lists
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Death