Congestion may refer to:

• Excessive fluid in tissues, vessels, or both, including:
  • Edema, abnormal accumulation of fluid in the interstitium, manifesting as swelling
    • Peripheral edema, edema in peripheral body parts such as limbs and feet
    • Pulmonary edema, edema in the lungs that impairs breathing
  • Congestive heart failure, heart failure resulting in congestion in one or more organs
  • Nasal congestion, the blockage of nasal passages due to swollen membranes
  • Prostatic congestion, a medical condition that happens when the prostate becomes swollen by excess fluid

• Network congestion, reduced quality of service when a network is carrying more data than it can handle
• Traffic congestion, vehicles clogging streets and highways
• Congestion pricing, a system of surcharging users of public goods that are subject to congestion through excess demand
• Congestion (film), a 1918 silent film