| Testerian | |
| Type: | Pictographic |
| Time: | 16th to 19th centuries |
| Languages: | Various |
| Creator: | Jacobo de Testera |
| Sample: | Garrett Mesoamerican Manuscripts, no. 3a, fol. 18v-19r (C0744).jpg |
Testerian is a pictorial writing system that was used until the 19th century to teach Christian doctrine to the indigenous peoples of Mexico, who were unfamiliar with alphabetic writing systems. Its invention is attributed to Jacobo de Testera, a Franciscan who arrived in Mexico in 1529.