GMT Gamesは、アメリカ合衆国のボードゲーム会社。カードゲームのバトルラインが有名だが、ウォー・シミュレーションゲームをメインに出版活動を行っている。

ゲーム雑誌の出版も行っており『C3-i』（英語）を1992年に創刊している。一部はFDF化され誰でも読むことができる。GMT C3i

オーダーが500集まると発売するP-500プロジェクトは、今ではおおくのボードゲームメーカーが行っているがこの会社が始めたのが初めてである。

ゲームシリーズ

Ancient World Series 
Carthage
Rise of the Roman Republic

Battles of the American Revolution(アメリカ独立戦争） 
Brandywine
Guilford
Monmouth
Pensacola, 1781 
Saratoga 2006 Edition
Savannah

Block Games 
1805: Sea of Glory P500
Asia Engulfed
Blood of Noble Men
C & C(Commands & Colors: Ancients): Ancients Exp. Pack #1 - Greece & the Eastern Kingdoms
C & C: Ancients Exp. Pack #2 - Rome & the Barbarians
C & C: Ancients Exp. Pack #3: The Roman Civil War
C & C: Ancients Exp. Pack #4: Imperial Rome P500
C & C: Ancients Exp. Pack #5: Epic Ancients I P500
Commands & Colors: Ancients
Crown of Roses
Europe Engulfed
For Honor and Glory
Forged in Fire
Hellenes
Sekigahara
The Bulge: FAB #1
Victoria Cross

Card-Driven Games 
Blue vs. Gray: The Civil War Card Game (ziplock)
Clash of Monarchs
Combat Commander Battle Pack #1: Paratroopers
Combat Commander Battle Pack #2: Stalingrad
Combat Commander: Europe
Combat Commander: Europe - 2008 Reprint
Combat Commander: Mediterranean
Combat Commander: Pacific 
Empire of the Sun
For the People, 2006 Edition
Here I Stand
Here I Stand - Mounted Mapboard
Kutuzov
Paths of Glory
Paths of Glory - Mounted Mapboard
Paths of Glory Player's Guide
Pursuit of Glory
Stalin's War
Ted Raicer's hex-based CDG of the War in Russia, 1941-1945
Successors
Sword of Rome
Sword of Rome 5th Player Expansion
The Halls of Montezuma
The Napoleonic Wars
Thirty Years War
Twilight Struggle
Unhappy King Charles!-イギリス清教徒革命
Two-player CDG set in the English Civil War
Washington's War
Mark Herman's two-player CDG on the American Revolution
Virgin Queen
Wellington
Wilderness War
Washington's War
Wellington
Wilderness War
WW2: Barbarossa to Berlin, 2006 Edition

Clash of Giants Series 
Clash of Giants
Clash of Giants II

Combat Commander 
Combat Commander Battle Pack #1: Paratroopers
Combat Commander Battle Pack #2: Stalingrad
Combat Commander: Europe
Combat Commander: Europe - 2008 Reprint
Combat Commander: Mediterranean
Combat Commander: Pacific

Commands & Colors: Ancients 
Commands & Colors: Ancients
C & C Ancients Mounted Mapboard
C & C: Ancients Exp. Pack #1 - Greece & the Eastern Kingdoms
C & C: Ancients Exp. Pack #2 - Rome & the Barbarians
C & C: Ancients Exp. Pack #3: The Roman Civil War
C & C: Ancients Exp. Pack #4: Imperial Rome
C & C: Ancients Exp. Pack #5: Epic Ancients I

Deluxe Maps 
Deluxe Map - Barbarossa to Berlin
Deluxe Map - Empire of the Sun
Deluxe Map - For the People
Deluxe Map - Paths of Glory
Deluxe Map - Sword of Rome
Deluxe Map - Wilderness War
Super Deluxe Map - The Napoleonic Wars

Down in Flames 
C3i DiF Squadron Pack #1: Fighters
C3i DiF Squadron Pack #2: Bombers
Corsairs & Hellcats
Eighth Air Force
The Rise of the Luftwaffe
Zero!

East Front Series 
Barbarossa: Army Group Center, 1941
Barbarossa: Army Group North, 1941
Barbarossa: Army Group South, 1941
Barbarossa: Crimea
Barbarossa: Kiev to Rostov
Typhoon!

Family or Euro Games 
バトルライン（Battle Line）
Blackbeard: The Golden Age of Piracy
Blackbeard: The Golden Age of Piracy - 2nd Printing
Conquest of Paradise
Formula Motor Racing
Ivanhoe: The Age of Chivalry
Leaping Lemmings
Santa Fe Rails
Winds of Plunder

Fast Action Battles (FAB) Series 
The Bulge: FAB #1

Flying Colors 
Flying Colors
Serpents of the Seas
Ship of the Line

Glory Series 
Glory
Glory II: Across the Rappahannock (ziplock)
Glory III

Great Battles of History(GBoH) 
Alesia
Attila
Barbarian (SPQR Module)
Caesar - The Civil Wars
Caesar: Conquest of Gaul
Cataphract
GBoH series Volume VIII: Justinian and the early Byzantine era
Chandragupta
Devil's Horsemen
Diadochoi
GBoH Module for Great Battles of Alexander Deluxe Edition
Dictator
Gergovia
Great Battles of Alexander - Deluxe
Lion of the North
Mamluk
Phalanx
RAN  -乱-  (MIMASETOGE(三増峠の戦い) (6 October 1569):MIMIGAWA 耳川の戦い(11 November 1578) :NAGAKUTE小牧・長久手の戦い (17 May 1582):NUNOBEYAMA 布部山の戦い（ふべやまのたたかい）(14 February 1570): OKITANAWATE 沖田畷の戦い(24 March 1584): SURIAGEHARA摺上原の戦い (5 June 1589): TENNOJI 天王寺・岡山の戦い(7 May 1615))
Salamis
Samurai -サムライ- (The Anegawa 1570(姉川の戦い),Sekigahara 1600(関ヶ原の戦い),Kawanakajima 1561 (川中島の戦い第四次合戦),Okehazama 1560 (桶狭間の戦い),Nagashino 1575(長篠の戦い),Mikata-ga-hara 1572(三方ヶ原の戦い))
Simple GBoH Battle Manual (c3i)
Simple Great Battles of History
SPQR
SPQR Dlx Scenario Pack
SPQR: Deluxe Edition
Tyrant
War Galley

Great Battles of the American Civil War（アメリカ南北戦争） 
Battles with the Gringos
Dead of Winter
Gringo!
Red Badge of Courage
River of Death
Three Days of Gettysburg

Musket & Pike Series 
Gustav Adolf: With God & Victorious Arms
Nothing Gained But Glory
Sweden Fights On
This Accursed Civil War
Under the Lily Banners

単発作品 
1914: Twilight in the East
A World at War
Arctic Storm
The Russo-Finnish Winter War, 1939-1940
Ardennes '44
Assyrian Wars
Bataan!
Battles of Waterloo
The Four Battles of Waterloo
Blackbeard: The Golden Age of Piracy
Blackbeard: The Golden Age of Piracy - 2nd Printing
Blitzkrieg General Super Deluxe Map
Blood and Sand
Blue vs. Gray: The Civil War Card Game (ziplock)
Borodino
Britain Stands Alone
Clash of Giants I
Cowboys, The Way of the Gun
Crisis: Korea 1995
Crisis: Sinai 1973
Crown of Roses
Downtown
Elusive Victory
Europe Engulfed
Fields of Fire
Grand Illusion
Great Campaigns of the Thirty Years War
Hellenes
History of the Roman Empire
Hold The Line
Hold The Line - French & Indian War Expansion Set
The German Invasion of Norway, 1940
June 6
Kasserine
Kutuzov
Lost Victory
Manifest Destiny
Manoeuvre
Men of Iron
Nightfighter
Normandy '44
Onward Christian Soldiers (Ziplock)
Operation Mercury
Pacific Typhoon
Pax Romana 2nd Edition
PQ-17
Prussia's Defiant Stand
Rebel Raiders on the High Seas
Reds!
Risorgimento 1859
Roads to Leningrad
Sekigahara(関ケ原）
Silver Bayonet
Sun of York
The Battle for Normandy
The Burning Blue
The Caucasus Campaign
The Conquerors: Alexander the Great
The Great War in Europe: Deluxe Edition
The Kaiser's Pirates
The Spanish Civil War
Tigers in the Mist
Triumph and Fall of the Desert Fox
Ukraine '43
Victory in the West
von Manstein's Backhand Blow

雑誌

C3-i Magazine 
GMTのゲームのサポート雑誌C3-i Magazineを，1992年に発売してから本誌21冊、C3i Magazine Specialを20冊発売している。

内容は毎号2～3のゲームの記事・追加シナリオ・バリアントルール・追加ユニットなどがメインである。

C3i Magazine Special 
Simple GBoH Battle Manual (c3i)
C3i DiF Squadron Pack #1: Fighters
C3i DiF Squadron Pack #2: Bombers