Romance language spoken primarily in Romania and Moldova. Four principal dialects may be distinguished: Daco-Romanian, the basis of the standard language, spoken in Romania and Moldova in several regional variants; Aromanian, or Macedo-Romanian, spoken in scattered communities in Greece, Albania, Bulgaria, Kosovo, and Serbia; Megleno-Romanian, a nearly extinct dialect of northern Greece; and Istro-Romanian, also nearly extinct, spoken on the Istrian Peninsula of Croatia. Mutual intelligibility between the major dialects is difficult; the Megleno-Romanian, Istro-Romanian, and Aromanian are sometimes classed as languages distinct from Romanian proper, or Daco-Romanian, which has many slightly varying dialects of its own. Moldovan, the national language of Moldova, is a form of Daco-Romanian. It is written in the Latin alphabet.

The first known text in Daco-Romanian dates from 1521, and the earliest inscription in Aromanian is dated 1731. Romanian phonology and grammar have developed in rather different directions from those of most other Romance languages because of the language's relative isolation from other Romance languages and its close contact with the Slavic languages and Hungarian. Romanian continues a Latin (Latin language) distinction between long o and short u, fused in most other Romance languages, but, like almost all others, it has lost the Latin distinction between long e and short i. In consonant clusters there has been a tendency to replace velar consonants k and g with labial consonants, such as p, b, or m (e.g., Latin ŏcto “eight,” Romanian opt; Latin cognatum “relative, kinsman,” Romanian cumnat). Nouns in Romanian have two cases, direct (nominative-objective) and oblique (possessive-dative), and have separate singular and plural forms for the noun standing alone and the noun with the definite article suffixed. Verbs have a shortened infinitive (e.g., a cînta from Latin cantare “to sing”), and the future tense is formed by a compound of the verb a vrea “to wish” plus the infinitive of the verb—voi cînta “I will sing”; an alternative method of future formation is to use the auxiliary verb a avea “to have” plus să plus the subjunctive of the verb—am să cînt “I will sing.”

The vocabulary of Romanian is, of course, based on that of Latin, but because of Romanian's isolation, loanwords from non-Romance languages are frequent. Most common are Slavic words, but borrowings from Turkish, Hungarian, and Albanian also occur.