In recent decades, there have been many authors who researched about the topic of employee engagement with a variety of approaches and significant findings. This research aims to study factors determining the organizational engagement of office workers. Samples were collected from 253 office workers in Binh Duong Province. The results from this study indicate that five factors that have a positive influence on employee engagement, in descending order, include job characteristics, job fit, rewards and recognition, employee voice, perceived organizational support. Especially, Justice factor is not statistically significant. Besides, testing the difference in the level of employee engagement by individual characteristics suggests that there is no difference in engagement by gender and seniority, yet there is a difference by age, in particular, the group under 25 years has a lower level of engagement than other groups (25 - 34 years, 45 - 54 years old, 55 years and older). Based on the findings, some implications are suggested to improve the human resources management of companies in Binh Duong Province through strengthening the organizational engagement level of office workers.