Playfair

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


 * Playfair 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