Kir Bulychev (Russian: ??? ???????; 18 October 1934 – 5 September 2003) was a pen name of Igor Vsevolodovich Mozheiko (?´???? ???´????????? ????´???), a Soviet Russian science fiction writer 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.