The purpose of this study was to determine the process of developing ethnomathematics-based teaching materials. The reference to the ADDIE development module consists of several phases namely Analysis, Design, Development, Implementation, and Evaluation. The product being developed is in the form of teaching materials, namely modules based on ethnomathematics on quadrilateral material which was tested on 24 class VII SMP Negeri Polebunging No. 5 Selayar Island. The instruments used in this study were expert validation sheets, student response questionnaires, teacher response questionnaires, and learning achievement tests. The limited trial carried out, an ethnomathematics-based module on quadrilateral material in class VII SMP Negeri Polebunging No. 5 Selayar Island has met the criteria of validity, practicality and effectiveness.