Capacity is the ability to hold, receive or absorb, or a measure thereof, similar to the concept of volume.
Capacity may also refer to:
- Capacity (economics), the point of production at which a firm or industry's average (or "per-unit") costs begin to rise, usually because some factor is fixed (often capital or land).
- Capacity (law), the legal ability to engage in certain acts, such as making a contract.
- In decision theory, a capacity is a subjective measure of likelihood of an event, similar to a membership function in fuzzy logic.