Aleksandr Dyadchuk (born 5 February 1983 in Alma-Ata) is a Kazakhstani sprint canoer who competed in the late 2000s and 2010s. At the 2008 Summer Olympics in Beijing, he was eliminated in the semifinals of the C-2 500 m event. At the 2012 Summer Olympics he was eliminated in the semi-finals of the C-1 200 m and the C-1 1000 m.