Playfair may refer to: * Playfair (surname) * Playfair (lunar crater) * Playfair (Martian crater) * PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by Hymn (software), Hymn *Playfair Project *TS Playfair, TS ''Playfair'', a Canadian sail training vessel *Playfair's axiom named after John Playfair *Playfair cipher, a manual encryption technique invented in 1854 by Charles Wheatstone *Playfair Cricket Annual *Playfair Race Course *Lyon Playfair Library, now called the Abdus Salam Library, at Imperial College London *''Play Fair!'', an HIV/AIDS brochure

See also