Triantafilopoulos or Triantafyllopoulos () is a Greek surname. The feminine form is Triantafyllopoulou. It can refer to:
Effie Triantafilopoulos, Canadian politician Konstantinos Triantafyllopoulos (born 1983), Greek footballer Kostas Triantafyllopoulos (1956–2021), Greek actor Makis Triantafyllopoulos (born 1954), Greek journalist Nikolaos Triantafyllopoulos (1918–1998), Greek sports shooter