Condition can refer to:

• A state of being.
• A disease, such as a heart condition.
• A proposition upon which another proposition depends, such as "if-then" statements. See logical conditional.
• To cause a certain response to a stimulus, see conditioning.
• To replace moisture or oils, especially in hair, see conditioner.
• To change climate to an appropriate level, see air conditioning.
• A status effect which is usually negative, see Condition (computer gaming).
• A state which is induced in the subject of a pscyhological experiment, see condition (experimental psychology).