Sialolithiasis is a common disease of the salivary glands. However, sialolith formation in the minor salivary glands is considered very rare. Clinical features can be unusual, and this can cause difficulties with diagnosis. In this case series, we report three rare cases of sialoliths found in the minor salivary glands; two cases presenting in the lower lip and one in the substance of the tongue. In all three cases, the diagnosis was not immediately clear. The literature suggests that sialoliths in the minor salivary glands may occur more frequently than previously thought, and they should therefore be included in the clinical differential diagnoses of submucosal swellings in the oral cavity.