Objective: The aim of the present study was to investigate the effect of zirconia core color and surface treatments on the shear bond strength to layered porcelain. The following zirconia core colors were assessed: a- white b- yellow. And the following surface treatments were evaluated: 1- airborne particle abrasion 2- selective infiltration etching.Materials and Methods: This study was conducted on thirty veneering porcelain discs, 2x2mm that were placed on six zirconia discs, 19.5 x 1.5mm. The zirconia discs were divided into two groups according to their final color: group 1 (White; 3 discs) and group 2 (Yellow; 3 discs). They were further subdivided according to the surface treatment: subgroup A (control) subgroup B (airborne particle abrasion) and subgroup C (selective infiltration etching). The disc-shaped layered specimens were cut, and shear bond strength (SBS) test was conducted.Results: The type of zirconia framework had an effect on the core–veneer bond strength. The bond strength to colored zirconia (26.0) was numerically weaker when compared to white (28.9) zirconia frameworks. Different surface treatments had different effects on the core–veneer bond strength according to the zirconia color used. Subgroup C (SIE) showed highest shear bond strength values (30.5 and 27.83) in both white and yellow frameworks respectively, while subgroup A (control) showed the lowest shear bond strength values (17.0) for white framework and (12.89) for yellow framework (p ≤0.05).Conclusion: The addition of coloring pigments to zirconia frameworks resulted in structural changes that require different surface treatment before veneering. To prevent delamination and chipping failures of zirconia veneered restorations, careful selection of both framework and veneer ceramic materials, in addition to proper surface treatment, are essential for maintaining good bond strength.