Sialolithiasis or salivary gland duct calculus or salivary stones are the most common pathologies of the salivary gland. Sialolithiasis accounts for more than 50% of diseases of the major salivary glands and is the most common cause of acute and chronic infections. Sialoliths are deposits obstructing the ducts of major or minor salivary glands or its parenchyma. Salivary stones larger than 15 mm are classified as giant sialoliths. The prevalence of sialoliths varies by location. About 85% of sialoliths occur in the submandibular gland and 5-10% occurs in the parotid gland. In about 5% of cases, the sublingual gland or a minor salivary gland is affected. Sialolith in the parotid gland is less common when compared to submandibular gland. This case report describes a case of giant sialolith of submandibular salivary gland.