In this research, the effects of three important input parameters of roller burnishing process, namely burnishing speed, feed rate and the number of passes on the surface integrity (surface roughness and surface micro-hardness) of Ti-6Al-4V alloy are investigated. The design of the experiment is carried out using a full factorial method. Measurement of process outputs is carried out with precise methods and the results are recorded and examined. The results showed that the parameters studied have a very significant effect on the surface roughness and micro-hardness of Ti6Al4V alloy. The feed rate is the most effective parameter on the surface roughness and the burnishing speed is the most effective parameter on the surface micro-hardness. Generally concluded, the roller burnishing process improves the final surface quality and increases surface micro-hardness. It also concluded that increasing the number of the burnishing passes from 1 to 2 would excel both of the output parameters while increasing of this parameter further has no significant effect or; in certain cases; an inverse effect on the surface roughness and surface micro-hardness. Manuscript profile