Objectives: Mineral trioxide aggregate (MTA) show physical and biological properties that can be used as the preservation of pulp vitality and regenerative techniques. The bond strength between MTA and restorative materials has great importance since MTA is often in direct contact with restorative materials. This study aimed to compare the shear bond strength (SBS) of bulk-fill composite resins to MTA. Materials and Methods: 45 acrylic blocks with central holes (5 and 2 mm in diameter and height, respectively) were prepared and divided into three groups of 15 according to the composites used (Tetric N-Ceram bulk-fill composite resin, Filtek bulk-fill composite resin, Estelite bulk-fill flowable composite resin). The acrylic cavities were filled with ProRoot MTA. After the application of bonding material and proper composite resin samples, the SBS was assessed using a universal testing machine. Data were analyzed through ANOVA. A p-value less than 0.05 was considered statistically significant. Result: Bond strength was significantly higher in samples of Tetric N-Ceram bulk-fill composite resin (P<0.05). However, there was no significant difference between the two other groups in this regard (P=0.99). Conclusion: ProRoot MTA and Tetric N-Ceram bulk-fill composite resin showed statistically higher bond strengths, compared to other bulk-fill composite resins.