Unique technologies are technologies introduced in Age of Empires II: The Conquerors that are unique to a civilization and can be researched at the Castle. In The Conquerors, every civilizations but the Goths (who had two) had access to exactly one unique technology. From The Forgotten and onwards, every civilization has access to two unique technologies, one in the Castle Age and one in the Imperial Age. They typically benefit one or more aspects of that civilization's characteristics and unique units.
Unique technologies can be disabled in favor of additional abilities and units via the "Full Tech Tree" option, thus granting a civilization access to contents that they normally cannot utilize (e.g. Native American civilizations can build Stables and train cavalry) at the cost of their characteristic upgrades that usually benefit their original playing style.
List of unique technologies 
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Castle Age Edit
| Civilization | Unique technology | Effect |
|---|---|---|
| Aztecs | Atlatl | Skirmisher range and attack increased |
| Berbers | Kasbah | Working speed of Castles increased for the entire team |
| Britons | Yeomen | Archer range and Tower attack increased |
| Burmese | Howdah | Battle Elephant armor increased |
| Byzantines | Greek Fire | Fire Ship range increased |
| Celts | Stronghold | Castles and Towers fire faster |
| Chinese | Great Wall | Hit points of Walls and Towers increased |
| Ethiopians | Royal Heirs | Shotel Warrior training time significantly decreased |
| Franks | Chivalry | Stables work faster |
| Goths | Anarchy | Huskarls can be trained at Barracks |
| Huns | Marauders | Tarkans can be trained at Stables |
| Incas | Andean Sling | Minimum range of Skirmishers and Slingers removed |
| Indians | Sultans | Gold gathering rate of all sources (Mines, trade, and Relics) increased |
| Italians | Pavise | Armor and pierce armor of foot archers increased |
| Japanese | Yasama | Towers fire extra arrows |
| Khmer | Tusk Swords | Battle Elephant attack increased |
| Koreans | Panokseon | Turtle Ship speed increased |
| Magyars | Mercenaries | Magyar Huszar gold cost removed |
| Malay | Thalassocracy | Turns Docks into Harbors |
| Malians | Tigui | Town Centers fire arrows even without garrisoned units |
| Mayans | Obsidian Arrows | Archer attack against standard buildings increased |
| Mongols | Nomads | Population is retained even if Houses are destroyed |
| Persians | Boiling Oil | Castles do more damage to Rams |
| Portuguese | Carrack | Armor and pierce armor of ships increased |
| Saracens | Madrasah | 33% of a Monk's gold cost are returned if he dies |
| Slavs | Orthodoxy | Monks have extra armor and pierce armor |
| Spanish | Inquisition | Monks and Missionaries convert faster |
| Teutons | Ironclad | Siege weapons have more melee armor |
| Turks | Sipahi | Cavalry Archer hit points increased |
| Vietnamese | Chatras | Battle Elephant hit points increased |
| Vikings | Chieftains | Infantry does more damage to cavalry |
