Lamella is a term for a platelike structure, appearing in multiples, that occurs in various situations, such as biology or materials sciences. It implies a thin layer (Latin), the same derivation as for `laminate'. It can mean:

• Lamella (zoology), a structure in an animal
• Lamella (mycology), a structure beneath the cap of a mushroom
• Lamella (materials), a structure within geological, biological, or synthetic materials
• Lamella (cell biology), a sub-cellular structure
• Lamella clarifier, a water treatment process
• Lamellar armour, a medieval type of armour similar to scale armour
• Lamella (soil morphology), an effect of clay illuviation in sandy soils
• Middle lamella, a pectin layer