Gramática de la lengua castellana

Gramática de la lengua castellana (lit.

'Grammar of the Castilian Language') is a book written by Antonio de Nebrija and published in 1492.

When it was presented to Isabella of Castile at Salamanca in the year of its publication, the queen questioned what the merit of such a work might be; Fray Hernando de Talavera, bishop of Avila, answered for the author Nebrija in a letter addressed to the monarch: After Your Highness has subjected barbarous peoples and nations of varied tongues, with conquest will come the need for them to accept the laws that the conqueror imposes on the conquered, and among them our language; with this work of mine, they will be able to learn it, as we now learn Latin from the Latin Grammar.

The book established ten parts of speech: nouns, pronouns, verbs, participles, prepositions, adverbs, interjections, conjunctions, gerunds and supines.

Works had previously been published on Latin usage, such as Lorenzo Valla's De Elegantiis Latinae Linguae (1471), but Grammatica was the first book to focus on the study of the rules of a Western European language besides Latin.