Flexural behavior of functionally graded concrete (FGC) beams was experimentally investigated. Fourteen sets of beams, including full depth (FD) fber-reinforced concrete (FRC) and FGC with diferent patterns and fber volume fractions (Vf %), were investigated under three-point bending. These patterns consisted of three layers with a constant middle part of lightweight concrete. The upper layer in the compression zone was either normal strength concrete or FRC having diferent Vf %. The lower layer in the tension zone was made from either FD FRC has the same Vf % or functionally graded FRC. The fbers used were hooked end steel fbers with Vf % of 0.5, 1.0, and 1.5%. The experimental results were also analyzed numerically and analytically. The experimental results showed that the fexural strength of FGC patterns ranged between 94 and 100% from that of FD FRC beams. However, their toughness indices ranged between 49 and 93% of the corresponding value of FD FRC beams. These ratios depend on Vf % and the presence of fbers in the compression zone. The efect of Vf % is more obvious in the descending part of the load–defection curve than the ascending part due to the presence of fbers bridging phenomenon following the maximum load. Vf % is more pronounced in the descending portion in all FGC patterns than in the FD FRC beams. There is a good agreement between the experimental results and those predicted by analytical and numerical models.