Osteomas are slow-growing, fibro-osseous tumors and the most common benign neoplasm of the nose and paranasal sinuses, with an estimated prevalence of approximately 3% in the general population. Despite their relatively low occurrence, the optimal management and treatment of osteomas remain uncertain. Asymptomatic and small osteomas can be managed conservatively through observation. However, surgical intervention is recommended for osteomas that are symptomatic, rapidly growing, causing facial deformities, leading to chronic rhinosinusitis, or extending beyond the frontal sinus. We recently encountered a 37- year-old man with a large symptomatic osteoma in the frontoethmoidal sinus. Due to the presence of orbital pain, we performed endonasal endoscopic sinus surgery with debulking by drilling. The procedure was successfully completed without complications.