Un diapasón es un dispositivo metálico (generalmente acero) con forma de horquilla, utilizado principalmente como referencia para afinación de instrumentos musicales.

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A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone after waiting a moment to allow some high overtones to die out. The pitch that a particular tuning fork generates depends on the length and mass of the two prongs. It is frequently used as a standard of pitch to tune musical instruments. The tuning fork was invented in 1711 by British musician John Shore, Sergeant Trumpeter and Lutenist to the court.

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