Dimopoulos or Demopoulos (Greek: Δημόπουλος) is a Greek surname. The prefix "Δήμ(ος)" can be a shortened version of "Demosthenes" or "Dimitrios", but can also mean "people", whilst the suffix "όπουλος" means "son of". This surname may refer to:
- Christos Dimopoulos (born 1958), Greek former football player
- Dean Demopoulos (born 1954), American collegiate and professional basketball coach
- Dinos Dimopoulos (1921–2003), Greek actor, film director, screenwriter and theatre director
- Harry Demopoulos, American medical researcher
- Konstantin Dimopoulos (born 1954), New Zealand sculptor and performance artist
- Santa Dimopoulos, Ukrainian singer
- Savas Dimopoulos (born 1952), Greek physicist
- Stergios Dimopoulos (born 1990), Greek football defender
- Steve Dimopoulos (born 1972), Australian politician
- Takis Dimopoulos (1898–1981), Greek essayist, novelist and philologist
- Thanasis Dimopoulos (born 1963) Greek former football player