Dušan Lajović, born 30 June 1990, is a Serbian professional tennis player.
Lajović has won one doubles title on the ATP Tour in his career. On 29 April 2019, Lajović reached his best singles ranking of world No. 23. On 8 June 2015, he peaked at No. 104 in the doubles rankings. He is best known for his clay court craft and strong flowing groundstrokes, especially his one-handed backhand. In recent years, he has proven to be a reliable and consistent player for the Serbian Davis Cup team contributing to their achieving one final, one semifinal, and three quarterfinals. He won his first tournament at the 2019 Croatia Open.