This study aims to describe the nominal phrase structure of the Mongondow language in terms of the relationship category of its elements and to describe the structure of the nominal phrase of the Mongondow language in terms of the semantic relationship. This study uses a qualitative method. The data sources of this study were native speakers of the Mongondow language, totaling 5 people. Data collection techniques used are observation, interviews, and recordings. The instruments used were observation sheets, interview questions, and a recording device. Data analysis was carried out descriptively starting from data simplification, data presentation, verification, and conclusion. From the results of the study, it can be concluded that the nominal phrases of the Mongondow language are classified into: 1) nominal phrases with nominal delimiters consisting of, 2) nominal phrases with adjective descriptors, 3) nominal phrases with verb delimiters, 4) nominal phrases with numeral descriptors, 5) nominal phrases with adverbial delimiters, 6) nominal phrases with postpositional phrases, 7) coordinating phrases, 8) attributive nominal phrases, and 10) appositive nominal phrases. Mongondow language nominal phrases have the following meanings: 1) the meaning of addition, 2) the meaning of selection, 3) the meaning of similarity, 4) the explanatory meaning, 5) the limiting meaning, 6) the meaning of the pointer, 7) the meaning of the number, and 8) the meaning of designation.