<p>The influence of steel fiber curvature on its adhesion with cement mortar reinforced with carbon nanotubes has been numerically studied in this research. For this aim, by conducting a parametric study and by the non-linear finite element technique, influence of the fibers geometrics on their bonding performance with concrete has been considered. Using the cohesive zone model, interaction between steel fiber and the cement is simulated. Furthermore, the results were compared against those obtained with straight steel fibers. This comparison revealed a significant enhancement in bond strength when utilizing curved fibers, with a 130% increase observed compared to straight fibers of equivalent diameter. Additionally, by increasing the bending of the fibers, bond strength is significantly increased, and maximum capacity of steel fiber is utilized. The new proposed fibers pull-out occurs as a result of failure or rupture, which is the most favorable state for the fibers. Accordingly, the pull-out load and absorbed energy values of the presented fibers are enhanced by 78% and 345%, respectively, as compared to straight steel fibers. Increases in the diameter and curvature radius of fiber result in an increase in the pull-out load and total work.</p>