This study aims to explore and describe ethnomathematics in the concepts of geometry and measurement in traditional games of West Sumbawa namely Barapan Kebo and Sampo Ayam. This research is exploratory research with a qualitative research approach. This research was conducted in 2020 in West Sumbawa District. The data collection techniques were interviews, observation, and literature study. The data analysis techniques used are data collection, data reduction, data display, and data verification. The results showed that there are concepts of geometry and measurement in the traditional games, Barapan Kebo and Sampo Ayam. The ethnomathematics in Barapan Kebo and Sampo Ayam are speed, time, distance, angles, lines, length units, triangular flat shapes, and rectangular flat shapes