Aztec codices are books written by pre-Columbian and colonial-era Aztecs. These codices provide some of the best primary sources for Aztec culture.

The pre-Columbian codices differ from European codices in that they are largely pictorial; they were not meant to symbolize spoken or written narratives. The colonial era codices not only contain Aztec pictograms, but also Classical Nahuatl (in the Latin alphabet), Spanish, and occasionally Latin.

Although there are very few surviving pre-conquest codices, the tlacuilo (codex painter) tradition endured the transition to colonial culture; scholars now have access to a body of around 500 colonial-era codices.