Aim: To compare and evaluate the fracture resistance of endodontically treated teeth restored with Rebilda post GT, EverStick post and prefabricated glass fiber post at 90-degree vertical load and 45-degree oblique load. Materials and methods: Eighty freshly extracted single-rooted mandibular premolars were selected, and after root canal preparation and obturation, standardized post spaces were prepared. Samples were randomly divided into four groups (n = 20) depending on the type of restorative technique used: group I restored with Rebilda post GT system (bundled glass fiber reinforced composite post), group II restored with EverStick post (Individually formable glass fiber root canal post), group III restored with prefabricated glass fiber post, group IV restored with direct composite resin restoration without a post (control). Using a universal testing machine, 90-degree vertical and 45-degree oblique load was applied to the restored teeth with a crosshead speed of 0.5 mm/minute. Fracture loads and mode of fracture was recorded. Results: The results of the analysis of variance (ANOVA) and post hoc Tukey HSD test revealed that the fracture resistance was significantly affected by different post systems (p < 0.001). Conclusion: Rebilda post GT samples showed maximum fracture resistance followed by the EverStick fiber post group, prefabricated post, and least in the control group.