A Tech-priest, also spelled Tech-Priest or even tech-priest, and formally known as a Tech-adept to the Adeptus Terra, is an adept of the Adeptus Mechanicus of the Imperium of Man who is generally responsible for maintaining all of the advanced technology of the Imperium, enlarging the Imperium's stocks of technical knowledge and conducting what little new scientific research occurs within the Imperium since the end of the Horus Heresy.

Tech-priests are members of the Cult Mechanicus, the Cult of the Machine, a priesthood which forms an ecclesiastical hierarchy of technicians, scientists, and religious leaders who believe that knowledge represents the only true divinity in the universe.

"My name binaric nonsense is Magos Argon Mallos of the Adeptus Mechanicus... bzzt say... your flesh looks rather weak... may i interest you in the glorious salvation of the machine god?"