| Thesaurus of the Guarani Language | |
| Title Orig: | Tesoro de la lengua guaraní |
| Orig Lang Code: | es |
| Country: | Spain |
| Language: | Old Guarani and Spanish |
| Pub Date: | 1639 |
| Native External Url: | https://archive.org/details/tesorodelalengua00ruiz |
| Native External Host: | Internet Archive |
The Thesaurus of the Guarani Language (Spanish; Castilian: '''Tesoro de la lengua guaraní''') is a Classical Guarani–Spanish bilingual dictionary written by the Peruvian Jesuit priest and scholar Antonio Ruiz de Montoya. It was published in 1639.[1] The Thesaurus was the first Guarani–Spanish dictionary. It gives examples of contexts in which to use the various words.[2]