Preposition case agreement in Croatian grammar is an important aspect of the language, as prepositions typically require nouns to be in a specific case. This means that the noun following the preposition must agree with the case required by the preposition itself. In Croatian, there are seven cases: nominative, genitive, dative, accusative, vocative, locative, and instrumental. Each of these cases has a different function and may be required by different prepositions. Learning and mastering preposition case agreement is essential to using Croatian grammar correctly and fluently.