Pyotr Petrovich Konchalovsky was a Russian and Soviet painter, a member of the Knave of Diamonds group.

Knave of Diamonds, also called Jack Of Diamonds, was a circle of avant-garde artists in Russia, heavily influenced by French styles, who sought "to unite the stylistic system of Cezanne with the primitive traditions of folk art, the Russian lubok and tradesman's signs." Named for the eponymous exhibition held in Moscow in 1910, the group's intention was to provoke the art establishment in Russia, challenge "good taste," and shock. The group remained active until December 1917.