|關於an overview of combat knifes in all games，參見combat knife。|
Although used during the Anchorage Reclamation simulation, you can obtain it for use in the Capital Wasteland by retrieving it from the sealed armory in the Outcast Outpost after completing Operation: Anchorage. It can be repaired using standard Combat Knives.
Though the in-game information claims that the Trench Knife is weaker, the only real difference between it and the Combat Knife is that it has a spiked handle guard and a slightly longer blade.
- It is possible to have unlimited Trench Knives outside the simulation by using the Gary 23 glitch and a glitch that allows acquisition of multiple weapons from the Quartermaster; for more information, see Operation: Anchorage Bugs
- In World War I, this was a weapon used by both sides when jumping into trenches for close quarters ambush operations. The blade was designed particularly for use on an enemy's helmet, with maximum damage for a blade of its size in mind. This model may have been classified as a "knuckle-duster" knife.