Naum Stoyanov Hadjimladenov was born on July 15, 1894 in Samokov. In 1921, he graduated in painting at the State Academy of Arts, Sofia, in the class of Prof. Ivan Mrkvichka. The same year he organized his first solo exhibition in Samokov. He started working as a teacher in his hometown. From 1934 to 1946, the famous painter and graphic designer lived in Sofia - he was accepted as a member of the SBH, worked in various newspapers, illustrated the "Ancient Bulgaria" library. In this period, Hadjimladenov participated in a number of OHI in the capital and other cities, in presentations of Bulgarian art abroad - "Roerich Museum" (New York, 1935), Prague, Athens (1938). Participated in the international biennial of humor and satire in Gabrovo.In 1937, Hadjimladenov was awarded a gold medal at the Paris Exhibition for his work "Market in Samokov". In 1938, at an exhibition of Bulgarian painting in Athens, he was awarded the Order of "St. Alexander". In 1954 and 1964 he was awarded the Order of Cyril and Methodius - 1st degree. In 1975, he was declared an Honorary Citizen of Samokov.

Works by Naum Hadjimladenov are owned by NHG, SGHG, the Art Gallery in Samokov, House of Humor and Satire - Gabrovo, the Art Gallery in Sliven and other regional galleries, private collections in Bulgaria, USA, Germany, Austria, France, Belgium, Great Britain, Italy, Spain, etc.
He died on August 20, 1985 in Samokov.