This article is devoted to the study of syntactic and pragmatic functions of the vocative and direct address constructions. Since the direct address in Latvian, in addition to the vocative, also permits the nominative and accusative, this article examines the relationships and conditions of use of these three cases depending on the noun declension. In Latvian, the vocative (and nominative and accusative used in the function of direct address) is also variously agreed with its attached nominal (noun, adjective, declinable participle) or pronoun, so in order to better understand the syntax and pragmatics of the direct address in Latvian, this article covers this issue as well. The analysis of the data shows that there are five possible pragmatic functions of direct address in Latvian. The choice of these functions is operated, taking into account the place (of the address) in the clause or text, the lexemes used, and various extra-linguistic factors.