Choanal polyps are one form of the nasal polyps that grow toward the choana with a single stalk. Septochonal polyp is a rare entity that originates from the mucosa of the nasal septum with choanal extension. The most common site of its origin is mainly the superior aspect of the posterior portion of the nasal septum. However, metaplastic ossification is a rare event in septochonal polyp and septochoanal polyp with metaplastic ossification has not been reported in the literature, to the best of our knowledge. Herein, we report a case of huge septochonal polyp with metaplastic ossification obstructing right nasal cavity and nasopharynx, which was successfully removed via transnasal endoscopic approach.