This article is based on the issue of polarization during the election of the Governor and Deputy Governor in West Nusa Tenggara (NTB) Province, Indonesia, in 2018. In the Election Vulnerability Index study, NTB Province scored 3.50 or had significant vulnerability related to candidacy, campaigns, contestants, and violence. This is interesting because it contradicts the goal of decentralization in 1998 since Indonesia entered the reform era. The reform era in Indonesia is being encouraged so that all government systems, including regional head elections, become more democratic. The reform era is also urged to eliminate specific ethnic issues, such as the Javanese controlling local government in Indonesia. However, what happened when reform and decentralization began to be implemented was the phenomenon of polarization at the local level when regional head elections were held. This article is interesting because it presents the factors that caused polarization in NTB society during the 2018 regional head elections. The method used in this article is a literature review. This article focuses on findings from relevant theories related to sociological voting behavior and polarization. This article also concludes that there was polarization in NTB society during regional head elections due to vital ethnic issues and harmful stereotypes about women as leaders in the region. In the 2018 election for Governor and Deputy Governor of NTB, four pairs of candidates participated, and there was one woman candidate for deputy governor. Apart from that, polarization is compounded by the presence of the media, which increasingly strengthens information regarding the ethnicity and gender of candidates in NTB society.