This study aims to examine the relationship between empowering leadership and employee voice behaviors. Based on self-determination theory, I argue that empowering leadership and employee voice behavior relationship is mediated by employee personal sense of power. In addition, coworker support and psychological contract violations moderate the indirect relationships leading to promotive voice and prohibitive voice. These hypotheses were partially supported by a sample of 168 employees across various industries and occupations. Results show that the mediating effect of sense of power between empowering leadership and promotive voice behavior relationship. In addition, bootstrapping results support the moderating role played by coworker support in the indirect relationship between empowering leadership and promotive voice behavior through sense of power. Theoretical and managerial implications are further discussed in light of these findings. Keywords: employee voice behavior, empowering leadership, sense of power, coworker support, psychological contract violations