Playfair may refer to:Playfair (surname) Playfair Playfair PlayFair, software that removes Apple's FairPlay DRM file encryption, now succeeded by HymnPlayfair Project 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