Kusma Sergeevich Petrov-Vodkin (1878, Khvalynsk – 1939, Saint-Petersburg) – painter.
In 1893-1895 studied at Burov’s classes in Samara, in 1897-1904 – at the Moscow School of Painting, Sculpture and Architecture, in 1901 – at Azbe’s studio in Munich. From 1906 to 1908 Petrov-Vodkin passed apprentice in several workshops in Paris.
In the first decade of the XX century he travelled a lot in France, Italy, Greece, Northern Africa.

In 1908 he moved to Saint-Petersburg and became teacher of painting. In 1918 – 1933 tought at the Academy of Arts.
Member of Mir Iskusstva (World of Art) fellowship.
Petrov-Vodkin’s particular style developed under influence of ancien Russian art, Italian primitivists, and French art. his spectrum is based on three open local colours – red, blue and yellow.

In 1920s, painter’s system of “spherical perspective” established, which marked his later works.
Author of memoir “Euclid’s’ space”.