Apostolos Konstantopoulos (Greek: Απόστολος Κωνσταντόπουλος; born 2 August 2002) is a Greek professional footballer who plays as a centre-back for Belgian club Beerschot.^[1]

Konstantopoulos played for Panetolikos youth academy for almost 13 years, before he start playing with the senior team. On 6 July 2020, he scored his first goal with the club in an away 2–2 draw against Atromitos and subsequently became the youngest football player to play in the Greek play-offs, the youngest to score in 2020–21 season, but also the youngest in the history of the club.^[2]

On 18 June 2021, Beerschot announced the acquisition of the 18-year-old central defender from a €500,000 transfer fee, who signed a contract until 2024 with the possibility of extending their cooperation for another year. The young defender last season played 26 times in all competitions, in his first full season with Panetolikos.^[3]