V42

V42 may refer to:
 * Honda V42 Magna, a motorcycle
 * ITU-T V.42, an error-correction protocol
 * LFG V 42, a German sport aircraft
 * Nissan Quest (V42), a minivan
 * V-42 stiletto, a fighting knife
 * Vanadium-42, an isotope of vanadium
 * V$4 2$, the third inversion of the dominant seventh chord