Andreas Hajek (born 16 April 1968 in Weißenfels) is a retired German rower.
At the 1986 World Rowing Championships, he replaced a sick Thomas Lange at short notice when he was only 18; he won a bronze medal at that occasion.
Hajek was the youngest East German team member that year.
During his career Hajek became a two-time Olympic champion and five-time world champion.