Iliopoulos (Greek: Ηλιόπουλος) is a Greek surname. Notable people with the surname include:

• Vasileios Iliopoulos (born 1988), Greek tennis player
• Dinos Iliopoulos (1915–2001), actor and film director
• Giannis Iliopoulos (born 1979), basketball player
• John Iliopoulos (born 1940), theoretical physicist
• Marios Iliopoulos (born 1969), heavy metal guitarist
• Panourgias Iliopoulos (1787–1865), soldier of Theodoros Kolokotronis during the Greek War of Independence