This study aims to examine differences in readiness for change based on ethnic background among communities in East Nusa Tenggara, Indonesia. Readiness for change is a psychological condition that reflects individuals’ cognitive and emotional acceptance of change, as well as their willingness to engage in change processes. A quantitative approach was employed, involving 67 respondents from seven ethnic groups, namely Manggarai, Nagekeo, Ngada, East Flores, Ende, Lembata, and Sikka, selected through purposive sampling. Data were collected using the Readiness for Change Scale developed by Armenakis and Harris. Statistical analyses included normality testing, homogeneity testing, one-way ANOVAs, and mean comparisons across ethnic groups. The results revealed a significant difference in readiness for change based on ethnicity (p < 0.05). The Manggarai, Ngada, and East Flores ethnic groups showed the highest levels of readiness for change, while the Maumere and Lembata groups exhibited the lowest scores. These differences are influenced by variations in cultural values, openness to social interaction, and acculturation orientations. The findings highlight that ethnicity plays an important role in shaping individuals’ attitudes toward change. This study contributes to cultural psychology by emphasizing the importance of culturally sensitive approaches in change management and social development programs. Keywords: cultural psychology, ethnicity, readiness for change