THD
# THD

THD may refer to:

* Total harmonic distortion, a measure of the distortion of an audio signal
* Total Hi Def (Total HD), an optical disc format
* Th.D. or D.Th. or D.Theol., a Doctor of Theology degree
* Thames Ditton railway station, Surrey, National Rail station code
* THD Electronics, a guitar amplifier manufacturer
* Transanal hemorrhoidal dearterialization, a surgical procedure
* That Handsome Devil, an American alternative rock band
* The IATA airport code for Thọ Xuân Airport
* The ICAO airline code for Thai Smile
* Transmitting Heading Device
