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The Knife, also known as the Butterfly Knife or Balisong, is the default melee weapon for the Spy. It is a foldable stylized butterfly knife with a handle clip and clip-point blade.

When holding the weapon while within melee range at a 180° radius behind an enemy, an animation plays wherein the Spy holds the Knife aloft in a striking position. Attacking at that point (even if the animation does not play out completely) causes the player to backstab the enemy, killing them in one hit unless the player backstabbed is a Sniper equipped with the Razorback or a player in any kind of invulnerability, such as the default ÜberCharge. In any other instance, such as when used from the side or front, the Knife deals 40 base damage, which is less than every other stock melee weapon except the Bat. Random critical hits do not occur when using the Knife.

In addition to backstabbing, the Knife swings instantly once the fire button is pressed, unlike other melee weapons in the game which have a delay before the attack actually occurs. This lets the player react quicker in melee combat when compared to other classes. This applies to all the Spy's other knives.

Taunting with the Knife equipped results in the Fencing kill taunt.