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THD may refer to: Doctor of Theology (Th.D. or D.Th. or D.Theol.) Thai Smile (ICAO code) Thames Ditton railway station, Surrey, England (National Rail station code) That Handsome Devil, an American alternative rock band THD Electronics, a guitar amplifier manufacturer Tho Xuan Airport (IATA code) Total harmonic distortion, a measure of the distortion of an audio signal Total Hi Def (Total HD), an optical disc format Transanal hemorrhoidal dearterialization, a surgical procedure