Lamella (pl.: lamellae) means a small plate or flake in Latin, and in English may refer to:

• Lamella (mycology), a papery rib beneath a mushroom cap
• Lamella (botany)
• Lamella (surface anatomy), a plate-like structure in an animal
• Lamella of osteon, the concentric circles around the central Haversian canals
• Lamella (cell biology):
  • (i) part of a chloroplast (thin extension of thylakoid joining different grana)
  • (ii) the leading edge of motile cells, containing the lamellipodia
• Lamella (crab), a group of land crabs in the family Gecarcinucidae
• Uroleptus lamella, a species of protozoans
• Middle lamella, a pectin layer which cements the cell walls of two adjoining plant cells together
• Lamellae, element of molar teeth in members of Elephantidae

• "Lamella", a concept in the psychoanalytic theory of Jacques Lacan
• Lamella (materials), a fine, plate-like structure, usually in a group
• Lamellar armour
• Lamella clarifier, an inclined-plate clarifier used in water treatment systems
• Lamella (structures), used to cover wide, open areas with no supporting members (i.e. arenas, "domes")
• Musical instrument reed