Mucinous cystadenoma is considered as a subtype of a rare benign salivary gland tumor, cystadenoma. Adenomatous proliferation of the epithelium is seen in cystadenomas of the salivary glands which is characterized by development of multiple cystic structures. Various morphologic variants of cystadenoma have been mentioned out of which mucinous and papillary type are important. It is very challenging to clinically differentiate it from cases of mucous retention and different benign minor salivary gland tumors. Salivary gland disorders have become a subject of extensive research due to its diverse patterns of presentation. This case report describes a benign mucinous lesion of salivary gland on the left angle of the mandible.