Diego Collado's Grammar of the Japanese Language (Latin: Ars grammaticae Iaponicae lingvae (i.e. Ars grammaticae Iaponicae linguae)) is a description of the Japanese language published in 1632, attempting to fit Japanese grammar into a Latin grammatical framework. An English translation by Richard L. Spear was published in 1975.

• Ars grammaticae Iaponicae linguae at Project Gutenberg (in Latin)
• Diego Collado's Grammar of the Japanese Language (English translation)