Dentigerous cysts are benign odontogenic cysts that surrounds the crown of impacted, embedded, unerupted or developing tooth. These cysts are the second most common odontogenic cysts of the oral cavity after radicular cysts and they are most frequently associated with impacted mandibular third molars, less frequent with canines and maxillary third molars. but dentigerous cysts involving impacted second premolars are extremely rare occurence. We hereby present a rare case of dentigerous cyst in fourteen year old male child associated with an unerupted/impacted mandibular second premolar which was successfully managed at our clinic.