Oleksandr Fyodorovich Manachynskyi (, ; 2 September 1958 â 1 January 2020) was a Ukrainian swimmer. He competed at the 1976 Summer Olympics in the 100 m and 200 m butterfly and finished eighth in the latter event. During his career he won three national titles, in the 100 m (1977) and 200 m (1976) butterfly and 4 à100 m medley relay (1976).
Between 1975 and 2000 he worked as a swimming coach with the Soviet and then Ukrainian national teams.
Manachynskyi died on 1 January 2020 at the age of 61.