This comprehensive case report details a rare presentation of Mucoepidermoid Carcinoma (MEC) in the minor salivary gland, manifesting with clinical characteristics remarkably similar to those of a benign fibroma. MEC, a predominant malignancy within the salivary gland neoplasms, primarily affects the major salivary glands, with occurrences in the minor glands being particularly rare and challenging to diagnose due to their indolent progression and atypical presentations. This report highlights the case of a 69-year-old female who presented with a painless, gradually enlarging mass in the floor of the mouth, initially presumed to be a traumatic fibroma based on its clinical appearance and location. Histopathological examination following an excisional biopsy revealed it to be intermediate-grade MEC, characterized by a mix of intermediate, epidermoid, and mucus-producing cells, along with notable mitotic activity and perineural invasion. Treatment includes surgical excision with clear margins and consideration of adjuvant radiotherapy, according to current guidelines for MEC management. This case underscores the critical importance of histopathological analysis in the differential diagnosis of oral lesions and the necessity for a high degree of clinical suspicion for malignancies in cases of atypical presentations. This case adds valuable insight into the diverse presentations of MEC and reinforces the importance of considering this diagnosis in the evaluation of persistent oral lesions, particularly when they mimic benign conditions.