Diamantopoulos or Diamandopoulos (Greek: Διαμαντόπουλος) is a Greek surname. The feminine form is Diamantopoulou (Διαμαντοπούλου). It may refer to:
- Adamantios Diamantopoulos [de] (born 1958), Greek-British business scholar
- Anna Diamantopoulou (born 1959), Greek politician
- Athanasios Diamandopoulos (born 1943), Greek physician
- Chris Diamantopoulos (born 1975), Canadian actor
- Constantine Diamantopoulos [el], fighter of the Greek War of Independence
- Costas Diamantopoulos (b. 1940) [el], Greek football player
- Costas Diamantopoulos (b. 1946) [el], Greek basketball player and coach
- Diamantis Diamantopoulos [el] (1914-1995), Greek painter
- Dimitris Diamantopoulos (born 1988), Greek association football player
- Evangelos Diamantopoulos [el] (born 1980), Greek MP elected in June 2012
- Georgios Diamantopoulos (fighter) [el], fighter of the Greek War of Independence
- Giorgos Diamantopoulos (born 1980), Greek basketball player
- Iakovos Diamantopoulos [el] (1905-1993), Greek physician and politician
- Stavros Diamantopoulos (born 1947), Greek football manager
- Takis Diamantopoulos (born 1939), Greek photographer
- Thanassis Diamantopoulos [fr], Greek political scholar
- Vasilis Diamantopoulos (1920-1999), Greek actor
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