Kir Bulychev (Russian: Кир Булычёв [Kir Bulychyov]; 18 October 1934 – 5 September 2003) was a pen name of Igor Vsevolodovich Mozheiko (И́горь Все́володович Може́йко), a Soviet Russian science fiction writer, critic, translator and historian. His magnum opus is a children's science fiction series Alisa Selezneva, although most of his books are adult-oriented. His books were adapted for film, TV, and animation over 20 times – more than any other Russian science fiction author – and Bulychev himself wrote scripts for early adaptations.