Absorption may refer to:

• Absorption (chemistry), absorption of particles of gas or liquid in liquid or solid material
• Absorption (electromagnetic radiation), absorption of light or other electromagnetic radiation by a material
• Absorption (acoustics) , absorption of sound waves by a material
• Flow (psychology), a state of total mental "absorption"

• Absorption (physiological)
  • Absorption (skin), a route by which substances can enter the body through the skin
  • Absorption (digestive), the uptake of substances by the gastrointestinal tract
  • Absorption (pharmacokinetics), absorption of drugs in body