Alexander Alexandrovich Osmerkin (Александр Александрович Осмеркин; 8 December [O.S. 26 November] 1892 - June 25, 1953) was a Russian painter, graphic artist, stage designer, and art teacher. He was a member of the Knave of Diamonds avant-garde group, AKhRR, and Society of Moscow Artists (OMKh) groups. Since 1932 he was a member of the Leningrad Artist Union.
Alexander Osmerkin was born in Elisavetgrad (now Kirovohrad, Ukraine) into the family of a post-office clerk. Young Osmerkin was raised by his Ukrainian nanny, who eventually stayed with him through the rest of his life as his personal assistant. He took his first art lessons at the drawing department at Elisavetgrad Regional Professional School under a Peredvizhnik painter Feodosy Kozachinskiy.
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In 1911–1913 Alexander Osmerkin moved to Kiev to continue his education in art. He attended classes at Kiev Professional School of Art. In Kiev he met Alexandra Exter and other avant-garde artists, who cast influenced on his vision and style. Although he cited Paul Cézanne as his main influence, Osmerkin absorbed from many sources and styles, before he created his own. He turned to Fauvism after seeing works of Henri Matisse and André Derain and other Fauvists. He visited St. Petersburg several times to study art at museums, and also made numerous landscapes in his own manner blending classical St. Petersburg cityscapes with his Fauvist touch. Eventually he settled in Moscow and joined Ilya Mashkov artistic studio. He followed his teacher and became the youngest artist in "The Jack of Diamond" group.