What was the primary language of the Aztecs?

The primary language of the Aztecs was Nahuatl. It was spoken by the Mexica, the people commonly called the Aztecs, and belonged to the Uto-Aztecan language family. During the Late Postclassic period, the variety spoken in and around Tenochtitlan became an influential prestige language across central Mexico.

Nahuatl was not necessarily a single uniform language. It included several closely related varieties spoken by Nahua communities in different regions. The language was used in administration, trade, poetry, religious life, and diplomacy. Nahuatl also had a major influence on modern Spanish in Mexico, contributing words such as “chocolate,” “tomato,” “avocado,” and “coyote.”

The answer is sometimes confused with Maya or Quechua, but those refer to other major Indigenous language traditions in the Americas. “Aztec” can also describe a broader political and cultural civilization, while “Nahuatl” precisely identifies the language associated with the Mexica and many related Nahua peoples. Nahuatl varieties are still spoken in Mexico today.