Alonso de Molina was a Franciscan priest and grammarian, who wrote a well-known dictionary of the Nahuatl language published in 1571 and still used by scholars working on Nahuatl texts in the tradition of the New Philology. He also wrote a bilingual confessional manual for priests who served in Nahuatl-speaking communities.

Nahuatl, Aztec, or Mexicano is a language or, by some definitions, a group of languages of the Uto-Aztecan language family. Varieties of Nahuatl are spoken by about 1.7 million Nahua peoples, most of whom live mainly in Central Mexico and have smaller populations in the United States.