Sessility, or sessile, may refer to:

• Sessility (motility), organisms which are not able to move about
• Sessility (botany), flowers or leaves that grow directly from the stem or peduncle of a plant
• Sessility (medicine), tumors and polyps that lack a stalk
• Sessility (in crystallography), dislocation that is not able to move in the slip plane (as opposed to glissile)

• Sedentism, in cultural anthropology, the practice of living in one place for a long time