Voynich may refer to:
- Ethel Lilian Voynich (1864-1960), British novelist and musician
- Wilfrid Michael Voynich (1865-1930), Polish revolutionary, discoverer of the Voynich manuscript, husband of Ethel
- Voynich manuscript, a mysterious undeciphered document from the 1400s, named after its re-discoverer, Wilfrid Voynich
- European Voynich Alphabet, or EVA, system to transcribe the Voynich manuscript