Discharge in the context to expel or to "let go" may refer to:

• A military discharge, issued when a member of the armed forces is released from service
• Termination of employment
• A patient discharge, when a patient leaves a hospital after his or her medical treatment is completed
• Conditional discharge, a criminal sentence allowing a defendant to avoid punishment if certain conditions are met
• The act of firing a gun
• Port of discharge (POD)

Discharge in the context of a flow may refer to:

• Electricity:
• Discharger, an electrical device that releases stored energy
• Battery discharging
• Electrostatic discharge
• Corona discharge, a type of electrical current flow.
• Direct current discharge, a plasma
• Discharge lamp, a light bulb that includes a discharge gas
• Partial discharge, a temporary breakdown of electrical insulation
• Static discharger, a device used on airplanes to maintain use of electrical equipment
• Discharge (hydrology), the amount of water flowing through the river
• Groundwater discharge
• Effluent released into a river or sea
• Discharging Method is a proof technique in discrete mathematics
• The flow of fluids from certain parts of the body:
• Menstruation or other vaginal discharge
• Nipple discharge
• Mucopurulent discharge

Other uses of discharge include:

• Discharge (band), the British hardcore punk band
• Bankruptcy discharge, the injunction that bars acts to enforce certain debts.
• In co-counselling, the ways in which pent-up emotional hurt can be released, eg via crying, laughter, etc.
• Discharge petition, the process of bringing a bill out of committee to the floor for a vote without the cooperation of leadership