| image=FileCrossbow 1.jpg|250px
| name= Crossbow
| affiliation=Black Mesa
| damage=50 points/bolt, 40 points/direct explosion
| ammotype=Feathered dart
| rate of fire=80 RPM
| range=Very long
| usedby=*Gordon Freeman
*Female Black Ops (cut)
| counterpart=Other CategoryAccurized weapons|accurized weapons
| entity= weapon_crossbow
| designer=Stephen Bahl (HD version)http//www.halflife2.net/forums/showthread.php?p=3059184&posted=1 Stephen Bahl as quoted on ''Marc Laidlaw Vault'' on the HalfLife2.net Forums
The '''Black Mesa Crossbow''' is a long range sniper weapon featured in ''Half-Life''. It is very effective against distant targets, but is difficult to utilize in close quarters or against fast moving opponents due to its very slow reload time and the low velocity of the shot. The primary trigger fires a bolt; the secondary trigger utilizes the scope.
In ''Half-Life'', the Crossbow is first acquired by the player during the chapter ''Half-Life storyline'', where it can then be used to kill an Ichthyosaur. After the chapter, it can be reacquired in the chapter ''Half-Life storyline Ethics|Questionable Ethics'', after Gordon had been stripped of his weaponry upon capture by Hazardous Environment Combat Unit|HECU Marines. The construction is modeled upon modern composite bows. Its ammo consists of five feathered darts in a magazine. These are fed one at a time into the firing mechanism, which utilizes a high-tension wire to launch the dart; while a scope fixed on top allows the player to zoom in on his or her target.
During ''Apprehension'', a scientist refers to the crossbow as a "tranquilizer gun", while an HEV Suit audio clip (not heard in-game, but included in the game's files) identifies the crossbow's ammunition as "neurotoxin-treated crossbow ammunition". Its effects on Ichthyosaurs (which stop and twitch before dying/losing consciousness upon being struck by several darts) support this. The bolts are instantly lethal to most targets however, including HECU soldiers and Vortigaunts.
Apart from the scientist's comment, it is unclear as to whether this neurotoxin is really a non-lethal tranquilizer, but just at such a concentrated dosage to be fatal to human sized targets, or if it is in fact a lethal drug developed presumably for use against Xen creatures by experimenters; nor is it clear whether the neurotoxin has an instantaneous effect or if it is the force of the impact that kills these targets.
Because the Crossbow was used only for unique tasks at Black Mesa Research Facility|Black Mesa, such as knocking out Ichthyosaurs (due to its ability to fire under water, uncommon amongst Gordon's arsenal); ammo for it is scarce, and neither soldiers nor security guards are ever seen using one. The only exception is one crossbow that is found in a specimen locker lying next to a dead security guard in the chapter ''Questionable Ethics''.
* The Crossbow is effective against most enemies, but is best saved for tough, slow moving enemies or those who are unaware. If attacking HECU|marines or Vortigaunts, aiming for the head results in a one hit kill, even on the hardest skill levels. In multiplayer, a zoomed shot to the head will instantly kill a fully healed and fully charged player.
* The Crossbow is particularly effective against Ichthyosaurs, since it is both powerful and capable of firing underwater. However, when fired underwater the bolt may lift or lower based on if the player fires upwards or downwards. Firing upwards causes the bolt to fly lower than your aim, and firing downwards causes the bolt to fly higher than your aim. Firing straight ahead is unaffected.
* Once targets start to move in any direction except a straight line, using a Crossbow becomes a game of chance. Aim in front of the opponent. If the opponent is using one, get into the habit of zigzagging and generally moving in awkward patterns.
*Like the .357 Magnum Revolver, it can be very lethal at close range.
*It is interesting to note that even though the Crossbow is said to kill targets because of its toxin, one shot can destroy a turret, which is inorganic.
*This is the only weapon that could kill a HECU soldier without alerting nearby HECU soldiers.
==Behind the scenes==
The female Black Ops were originally to be armed with Black Mesa Crossbow|crossbows. The quivers used to hold the crossbow bolts are still featured in the model, attached to the belt.
*In multiplayer games of ''Half-Life'', the Crossbow has a somewhat different functionality When fired ordinarily, the bolts explode on impact with a small amount of splash damage. When fired while using the scope, the bolts do not explode, and travel to their target instantaneously, just like the Colt Python.
* Crossbow bolts in ''Half-Life'' are not affected by gravity. In ''Half-Life Source'', the bolts are affected by gravity over long distances and follow a slight downward arc as they travel. Users firing over long distances must account for this drop by aiming slightly above the target.
*Aside from the 9mm Glock and the RPG, the Crossbow is the only projectile weapon that can be used underwater.
*During reloading the entire clip is pulled through the gun but the bolt holder doesn't come out of the top and simply disappears.
*There is one Crossbow clip found in ''Power Up'', even though the Crossbow is not obtainable until ''Apprehension''.
*Additional ammunition can be found in a hard-to-reach room just before the player obtains the Crossbow. There are four clips in a submerged room of Apprehension in which Gordon must swim through the sewers to retrieve the clips.
*Despite the crossbow not being obtainable (without cheats) in ''Half-LifeOpposing Force'', Crossbow ammo can be found in a Weapon Box in one of the reachable Xen locations using the Displacer Cannon.
*Originally, there were supposed to be sounds for the removal and insertion of the clip for the Crossbow.
FileBlack Ops oldpromo.jpg|Early promotional image for the Black Ops, with the crossbow.
FileBm31.2.png|Female Black Ops model using the crossbow.
FileOld BM crossbow.jpg|Early viewmodel from ''Half-Life'' SDK.
FileCrossbow vents beta.jpg|Early in-game screenshot, facing a Houndeye.
FileCrossbow Gphoria.jpg|The Crossbow used as placeholder for the Resistance Crossbow on the wikipediaG-Phoria|G-Phoria 2004.
FileCrossbow hl1 hud.png|HUD icon.
FileCrossbow world HD.jpg|HD worldmodel.
FileCrossbow hd.png|HD viewmodel.
FileCrossbow ammo hd.jpg|HD ammunition.
FileHL BMRF Waterplc.jpg|The crossbow as it is first seen in a cage.
==List of appearances==
CategoryWeaponsCategoryBlack Mesa weaponsCategoryBlack Ops weaponsCategoryCrossbows