The purpose of this article was to present a guided lateral window sinus lift procedure with the aid of afully digital workflow using surgical templates for window osteotomy preparation and implant placement.A 22-year-old patient with insufficient residual bone height in the posterior maxilla was treated with amaxillary sinus augmentation procedure with a lateral window technique and simultaneous implant instal-lation using 3-dimensionally printed surgical guides. The surgical guides, used for the preparation of boththe lateral window and the implant site according to the optimal prosthodontic and anatomic position,were based on a fully digital workflow and virtual pre-planning with modified implant-planning software.Successful functional and esthetic rehabilitation of the patient was accomplished using standard surgicaltechniques and instruments but an innovative method for the production and application of surgical tem-plates ensured a precise and safe approach for the lateral window osteotomy preparation. This guidedlateral window sinus lift technique may reduce the incidence of surgical complications and failures andenhance patient-related outcomes.