Background: Foramen magnum (FM) is the largest foramen in the skull. It lies in an antero-median position and leads into the posterior cranial fossa. The present study was conducted to assess different shapes of foramen magnum. Materials & Methods: 56 dry adult human skulls of either gender obtained in Anatomy department will be selected and the shape of foramen magnum will be determined. Results: Out of 56 dry skull, 26 were of males and 30 were of females. Shape found was round in 26, oval in 14, irregular in 5, hexagonal in 3, pentagonal in 4, pentagonal in 4, tetragonal in 2 and egg shaped in 2 cases. The difference was significant (P< 0.05). Conclusion: The analysis of various shapes of foramen magnum is utmost important. This study provides guidance to the surgeons, radiologists, orthopedics, anthropologists as well as forensic experts