The seal knife is available to all players by default while the other melee weapons are purchasable with game points or cash points. Most melee weapons movement speed is 250 units per second, meaning they suffer no speed reduction. Every player starts out with the seal knife (provided they haven't brought another melee weapon yet); unlike the primary and secondary weapons, it cannot be dropped.
Seal knife is the default melee weapon in Counter-Strike series and Counter-Strike Online. It is available for free to every players. Seal knife is usually being used in close combat situations, stealth kills and rushing tactics. It is undroppable. This weapon are belonged to all male characters as their spawn melee weapon by default. This weapon can do instant kill if a backstab or headshot is scored.
The Cold Steel Knife is the spawn weapon for every female characters in Counter-Strike Online. The Cold Steel Knife has the same function as the Seal knife. It is used when the player is using female characters only.
The Hunting Dagger is purchasable with game points and possess a slight advantage from the seal knife. It has higher swing rate than the seal knife. Note that the hunting dagger uses Counter-Strike: Condition Zero knife animation.
Balisong has high swing rate even for stabbing but it is purchasable by cash points only and it does lower damage to enemy. It takes three stabs to kill an enemy instead of the seal knife's two. Recommended for Zombie Scenario in bonus rounds.
Sabit (or Parang in game or Axe for certain countries) does very high damage to enemies. It can kill an enemy with just two hits from the front. Moreover, it can kill an enemy with just single hit on the back. Sabit is recommended for knife battles.
The Nata Knife does extremely high damage to both humans and zombies, capable of killing a normal zombie with just one hit on the back. It can only be used in Zombie modes and Zombie Scenario.
The Hammer can knock zombies far away. It is recommended to use when a zombie are approaching towards you. It can only be used in Zombie modes and Zombie Scenario.
Dragon Claw is a melee weapon in Counter-Strike Online obtainable randomly from Code Box. This is the first dual-wielded melee introduced in Counter-Strike Online series.
Combat knife is a melee weapon that is able to deal very high damage to enemies, it is purchasable with cash points. It has a improved variant called Master Combat knife.
The upgraded version of Combat Knife can only be obtainable from it's upgrade event. It has longer range and does higher damage than the original weapon. The user can easily attack enemies from a relatively safe distance.
The SKULL-9 is the first melee weapon in Skull Series and it is made from some kind of special alloy material invented by the government. It has murderous destruction power, especially to zombies.
Wakizashi or Katana has further attack range then most melee weapons and can kill an enemy with just one slash. However, it is heavier than most melee weapons.
Dual Wakizashi or Dual Katana is the upgraded version of Wakizashi, it has the same propeties but it's dual wielded and slashes faster than the single wielded variant.
Dual Nata Knives can only be obtained randomly by Sidekicks in Zombie 3: Hero and has higher damage than the single-wielded Nata Knife. It is a couple of knives on a syringe handle with some sort of Poison Gun. It has faster slashing rate in primary mode.
Green Dragon Blade or Guan Yu Blade is a melee part of Dragon firearms. It has the ability to kill multiple targets with a single slash, similar to Skull-9. There are many aspects where it is similar to Skull-9. This melee is obtainable from Bingo Event and Code Box.
BALROG-IX is a melee part of Balrog Series. It deals fatal damage to both humans and zombies. It also uses the Balrog Charging System to deal explosive damage.
Serpent Blade is an event based melee in Counter-Strike Online. It is only avaliable during special events. It shares the same animations with the Wakizashi.
Beam Sword is a science fiction melee weapon made by an unknown technology. It can glow in the dark and the user can turn off the light to increase movement speed. Only obtainable through Bingo Event.
The Joker's Staff is the only melee weapon which can be used by the Joker in Hidden mode. Its primary attack can kill a human with 3 slashes while 1 slash in secondary mode. Note that in secondary mode, there is a slight attack delay.
An alternate skin for Tomahawk. It serves as the default melee weapon in Zombie Shelter and the player must use it to collect resources and attack enemies.
This is a melee weapon developed by Aegis Institute. It is equipped with Janus Transformation System that can be activated after the user has attacked the enemies for several times with this weapon. Janus form can deal a great damage to enemies.
This modification was made by an unknown Terrorist group to be used as a demolition tool as well as an normal crowbar to remove nails. The major change noted is the addition of a taser to improve its efficiency when taking down targets.
Featured in Attack On Titan, this blade can attack the Titans' weaknesses, quickly hacking and performing special attacks that give fatal injuries to everything that stands in its way.
This is a melee weapon developed by Aegis Institute in form of a scythe. It is incorporated with continuous separation technique that allows the user to perform a flurry of stabs whenever Thanatos Blade System is in use.
A special sword developed by Aegis Institute and applied with Vulcanus Parts System. When the gas line parts are activated, it can deal tremendous damage to enemies.
A huge breath of life filled with overwhelming power of the ancient giant storm is transferred to the owner by simply holding this hammer with both hands. If in possession, the user will be granted with the following buffs:
Draw attack: the user performs a quick strike whilst drawing the weapon.
Combination attack: the user can perform a chained attack by pressing RMB (default) upon drawing the hammer.
A special gauntlet served as the melee weapon with a strong destructive power. Secondary mode centered in the middle of the gauge CROW Reload System operation during attacks by right-clicking produces knocking them back during the attack of the zombies with a powerful destructive force to the front.
A blade that bears a mysterious, ancient power that provides extreme sharpness and hardness. The blade's power can be charged and it has the ability to emit a powerful force which gives a tremendous damage per hit.
A Japanese war fan that is designed for use in warfare, used by the samurai class of feudal Japan. It is made from iron and can be folded to make a powerful attack in the form of a fold. When opened, it can blow away enemies in the air. Each attack is slow, but if the is timing well, you can maximize the effect by attacking continuously.
BALROG-IX is a melee weapon developed by Aegis Laboratory. Primary attack does a fast punch while the secondary attack delivers a massive explosive punch after charging it. The WC edition has chrome effect on it and exclusively released to commemorate CSO World Championship 2016.
It is a gauntlet-type close-up claw that gives strong destructive power. Equipped with TURBULENT Engine System in 2nd mode and using the blade attached to the Gauntlet. Fast continuous attack is possible.
In order to destroy the evil that makes the world go astray, these dual swords, which are infused with huge power, are able to take them down. If the special trigger conditions are met, the feast unfolds.
Two daggers used by Agent Jay, who serves Douglas Jacob. She has been through many battlefields with this weapon. It can deliver fast and fatal attacks.
A legendary sword that, with the chosen guardian's blessing, will judge evil with sacred power. If you're facing an evil presence, the sword will strengthen, and the Holy Impact and Holy Crash skills will be enhanced.
Trivia
Drawing out melee weapon results a sound that can be heard in predetermined distance. Despite of revealing presence, it can be useful to lure one or few players.
Melee weapons do lower damage in Frag War submode.
