Lev Abramovich Kassil (Russian: Лев Абрамович Кассиль; 10 July 1905 – 21 June 1970) was an influential Soviet and Russian writer of juvenile and young adult literature and screenwriter, depicting Soviet life, teenagers, school, sports, culture, and war.

His most important works were two autobiographical novels for young people dealing with student life before the Revolution, Konduit (The conduct book, 1929, tr.

His books were often "development novels", describing how young people could, despite their mistakes, reach a mature view of life.

In 1950 he received the Stalin Prize for his book «Улица младшего сына» (1949, co-authored with M. Polyanovsky), the life story of young Volodia Dubinin and his struggle during the German invasion of the Soviet Union.

[3] A minor planet, 2149 Schwambraniya, discovered in 1977 by Soviet astronomer Nikolai Chernykh, is named after the fictional land from his novel The Black Book and Schwambrania.