Transfer of electrical signals via capacitance.

alt=capacitive deionization|thumb|306x306px|An illustration of capacitive deionization device.

In electrical engineering, capacitive sensing (sometimes capacitance sensing) is a technology, based on capacitive coupling, that can detect and measure anything that is conductive or has a dielectric constant different from air.

A capacitive power supply or capacitive dropper is a type of power supply that uses the capacitive reactance of a capacitor to reduce higher AC mains voltage to a lower DC voltage.

Capacitive micromachined ultrasonic transducers are a relatively new concept in the field of ultrasonic transducers.