Diglossa can refer to
- Diglossia, a linguistic term in which, in a given society, there are two (often) closely-related languages, one of high prestige, which is generally used by the government and in formal texts, and one of low prestige, which is usually the spoken vernacular tongue. In Linguistics, diglossia is a situation where in a given society there are two (often closely-related languages one of high prestige, which is generally used Vernacular refers to the Native language of a country or a locality
- Diglossa (bird), a flowerpiercer genus