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Call of Duty: Modern Warfare 3 is a first-person shooter video game, developed by Infinity Ward and Sledgehammer Games, with Raven Software having assisted in development.It is the third installment in the Modern Warfare series, a direct sequel to 2009's Call of Duty: Modern Warfare 2, and the eighth Call of Duty installment.

The game was released on November 8, 2011 in North America on Microsoft Windows, Xbox 360, PlayStation 3, and Wii, with a separate version for Nintendo DS developed by n-Space. In Australia, the Wii version was released on November 23, 2011. In Japan, Square Enix handled the installment with a separate subtitled and dubbed version, as they did for Call of Duty: Black Ops, released November 17, 2011 and December 22, 2011 respectively. Within 24 hours of going on sale, the game sold 6.5 million copies in the U.S. and UK alone and grossed $400 million, making it the biggest entertainment launch of all time.

The entire Killstreak reward system has been revamped. Killstreaks are now known as Pointstreaks, and kills are no longer the only way to increase the player's pointstreak. Completing objectives such as planting the bomb in Search and Destroy or capturing a flag in Capture The Flag awards points towards the player's Pointstreak. Pointstreak rewards are organized into three different "strike packages" called Assault, Support, and Specialist.

The Assault strike package works the same as the Killstreak reward system in Modern Warfare 2 and Black Ops: the player must earn more and more points without dying. Once the player is killed, his or her points are reset to zero. Likewise, the Specialist strike package rewards players with perks after every second consecutive kill.
Upon death, however, the player loses all the perks and the points are reset to zero. In contrast, the Support strike package are awarded based on the total points that the player has earned over the entire match, regardless of how often the player dies.Players are allowed to choose which Pointstreak rewards they want to use when they gain it during the match, rather than choosing them between rounds.

Along with revamping the entire Killstreak reward system, Modern Warfare 3 also has a completely modified Ranking and Unlocks system, which does not use a currency system for unlocks. The player's primary weapon levels up alongside the player, and unlocks a number of "Proficiency" perks such as Attachments, (allows two attachments and is a successor to the "Bling" and "Warlord" perks), Kick (reduced recoil while aiming down the player's sight) and Focus (reduced flinching while under fire).

Only one Proficiency can be put on a primary weapon. Another new addition is the ability to equip "Hybrid Scopes" on a weapon, such as a Reflex Sight a magnifier similar to an ACOG on the same weapon, and the player can switch between the scopes.Modern Warfare 3 introduces a new "Prestige Shop" which will unlock only after the player has selected the option to prestige for the first time. The "Prestige Shop" allows Prestige players to use tokens they gain from using the Prestige option to buy exclusive features such as double XP and an extra custom weapon class.

Several controversial perks in Modern Warfare 2, accused of being overpowered, have been removed in Modern Warfare 3. Diving from standing to prone, known as "dolphin diving", has been removed due to balancing issues. Modern Warfare 3 will utilize Treyarch's hot fix system to fix bugs and glitches.Modern Warfare 3 features a local and online split-screen option.

Several new game modes have also been added:
▪ "Kill Confirmed" requires players to collect floating dog tags from the corpse of a downed enemy before the kill can be registered. However, the opposing team can pick up the dog tag as well to deny the other team of a kill.
▪ "Team Defender" requires both teams to try to capture a flag dropped by the first person who gets killed when the match starts, and hold it to gain double points per kill while the team without the flag only gets the default amount per kill.
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Private matches also now include pre-made game modes including: "Infected" (where the infected kills enemies to recruit them to their team), "Drop Zone" (where the player must hold a drop zone for points and care packages), "Team Juggernaut" (each team plays alongside an AI Juggernaut character), "Gun Game" (be the first to get one kill with every gun in the game), "One in the Chamber" (in which players are only allowed one pistol with one bullet and three lives where they can only get more bullets by killing other players), and "Juggernaut" (free for all against a juggernaut, kill the juggernaut to become it). Along with this, players are allowed to create their own game modes with customized settings such as number of players and time limit.