Oral soft tissues line the inside of the mouth and play essential roles in protecting deeper tissues, aiding in speech and chewing, and detecting sensations such as temperature and pain. These tissues include the gingiva, inner cheeks (buccal mucosa), lips, tongue, floor of the mouth, soft palate, and the mucosa covering the alveolar bone. They are made up of layers of stratified squamous epithelium, either keratinised or non-keratinised, supported by connective tissue called the lamina propria. The oral soft tissues also contain minor salivary glands, tonsils, blood vessels, nerves, and immune cells that help maintain health and respond to injury or infection. Understanding the structure and function of oral soft tissues is essential for recognising normal anatomy, identifying early signs of disease, and providing effective dental care. These tissues also reflect changes in general health, making them valuable in diagnosing systemic conditions. This chapter introduces the key features of oral soft tissues, including the oral mucosa.