Oliver Blackburn Shallenberger was an American electrical engineer and inventor. He is associated with electrical inventions related to alternating current. He is most noted for inventing the first successful alternating current (AC) electrical meter, the forerunner of the modern electric meter. This was critical to general acceptance of AC power.

An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed by a residence, a business, or an electrically powered device.