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 Haplogroup E-V42, a paternal genetic lineage V, the third inversion of the dominant seventh chord