Background: Giant olfactory groove meningiomas (OGMs), though rare, pose challenges due to their size. These slow-growing tumors often remain asymptomatic until exceeding 6 cm in diameter. While surgery has advanced, understanding long-term outcomes remains crucial. Methods: This retrospective study at a major medical center included all patients with giant OGMs (>6 cm) undergoing resection from 2000-2022.Data on visual status, recurrence, and functional status were collected. Multivariable logistic regression identified predictors of recurrence and functional outcome. Results: Thirty-two patients met the inclusion criteria for this study, with a mean age of 55.8years.The mean follow-up period was 62months. The majority of giant OGMs were classified as WHO grade 1(84.4%).Postoperatively, 19patients demonstrated improvement in visual acuity and visual field deficits.Radiological recurrence was observed in nine patients(28.1%) at a mean follow-up of 56months, with only three requiring reoperations for tumor resection.One patient developed a brain abscess, necessitating reoperation.Multivariable analysis identified patient age, Simpson grade of excision, and WHO grade as significant predictors of recurrence rate. Conclusions: This study demonstrates that surgery can improve visual deficits and functional outcomes. Postoperative outcomes were strongly predicted by age, resection extent, and histological grade. Developing a new predictive scale based on these parameters appears to strongly predict the Giant OGMs Long-Term outcome.