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The term Open circuit may refer to:
- Open-circuit scuba, a type of SCUBA-diving equipment where the user breathes from the set and then exhales to the surroundings without recycling the exhaled air
- Open circuit test, a method used in electrical engineering to determine the impedance in the excitation branch of a real transformer
- Open-circuit voltage, the difference of electrical potential between two terminals of a device when there is no external load connected
- An electrical circuit is an "open circuit" if it lacks a complete path between the terminals of its power source; in other words, if no true "circuit" currently exists, because for instance a power switch is turned off
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