The aim of this research is to examine the relationship between whistleblowing and organizational citizenship behaviors in textile sector operating in Denizli province. The textile production and sales have always been placed on the top for the economic structure in Denizli. One of the important concepts of whistleblowing can be defined as revealing illegal and immoral practices in an organization. The concept of Organizational Citizenship Behavior (OCB) is defined as the assumption by employees of positive roles toward the organization about issues that do not fall within their own area of duty, on a voluntary basis and without having any expectation. The study used an empirical approach which includes qualitative and quantitative methods of analyzing data. The data were gathered through surveys from 12 SME firms in textile sector. In total, 192 useable surveys were obtained. The results revealed that there are statistically significant relationships between whistleblowing and organizational citizenship behavior in textile sector.