Grammatica Litvanica

Grammatica Litvanica (Lithuanian: Lietuvių kalbos gramatika, lit. 'Lithuanian grammar') is the first prescriptive printed grammar of the Lithuanian language which was written by Daniel Klein in Latin and published in 1653 in Königsberg, Duchy of Prussia.

The book was published by Johann Reusner who had settled in Königsberg back in 1639, while the editing of the manuscript was entrusted to the priest Johann Lehmann. Lehmann had served in the Lithuanian churches in Klaipėda. The book follows then-traditional grammar schemes for studies in Latin, Greek and Hebrew. The lexical material is taken primarily from the Lithuanian vernacular of the 17th century, with Klein trying to prove that the Lithuanian language can have its own grammar. Klein was also trying to convince Frederick William, Elector of Brandenburg and the Prussian authorities to enable the publication of Lithuanian books.

Under the influence of Klein's efforts to systematically describe the grammatical structure of the Lithuanian language for the first time in his various works, more stable general language norms were introduced into Lithuanian. The new norms were based on the dialect of Western Aukštaitians (English: Western Highlanders).