Abstarct: The main objective of this research is to investigate the relation between single fiber pull-out and mechanical properties of High Performance Fiber Reinforced Cementitious Composites (HPFRCC). The research is divided into four parts. In the first, mechanical properties of cementitious matrix including compressive strength, tensile splitting strength, flexural strength and direct tensile strength of matrix have been determined. In the second part, pull-out behavior of inclined hooked steel fiber has been evaluated by means of experimental tests on single fiber embedded in cementitious matrix. The effect of fiber embedded length and inclination angle are evaluated together with the interaction of these parameters. The pull-out results indicate that increase in embedded length and inclination angle result in increase of pull-out energy. An inclined fiber with respect to the loading direction absorbs a greater amount of energy at a given slip than one that is aligned, with maximum pull-out energy occurring around 30 degree. Fiber efficiency increases as the embedded length of fiber increase. Maximum fiber efficiency occurs at 30 to 45 degree and decreases at greater inclination angle. In the third part of this research, tensile behaviors of HPFRCCs have been evaluated by means of direct tensile and four-point bending tests on composites reinforced with 1%, 1.5%, 2% steel hooked fibers. Parameters describing flexural behavior are load carrying capacity, energy absorption capacity, deflection capacity and cracking behavior. The results show that increase in fiber volume fraction promotes flexural behavior from deflection softening to deflection hardening as well as improvement in all aspects of mechanical properties. Deflection capacity gains the most from deflection hardening besides substantial increase in load carrying capacity and energy absorption. Direct tensile strength tests were also carried out on dog-bone shape specimens. All reinforced composites showed strain-softening behavior. The obtained results indicate that increase in fiber volume fraction result in increase of post-cracking strength and energy absorption of composites.