Acinic cell carcinoma is a rare, low grade malignant tumor of the salivary glands. Most frequently it originates from major salivary glands almost exclusively in parotid gland and rarely from minor salivary glands. In this report we present a case of 64-year-old man with a persistent swelling within the mucosa of the lower lip at the line of the canine tooth for two years. The lesion was painless, soft in texture, mimicked a mucocel and had the dimensions of 1x1.5 cm with an overlying mucosa normal in color. Surgical excision of the lesion is performed and histopathological confirmation revealed acinic cell carcinoma.