Ecuador was represented at the 2004 Summer Olympics in Athens, Greece by the Ecuadorian National Olympic Committee.
In total, 16 athletes including 11 men and five women represented Ecuador in seven different sports including athletics, boxing, judo, shooting, swimming, tennis and weightlifting.
Athletes in the delegation included race walker Jefferson Pérez, a former Olympic champion at his fourth Olympics, and tennis player Nicolás Lapentti who returned for his second Olympics after an eight-year absence due to injury. Weightlifter and Pan American Games champion Alexandra Escobar was selected to carry the Ecuadorian flag in the opening ceremony.
{| class="wikitable sortable" style="text-align:center;"
! width=180|Sport
! width=55|Men
! width=55|Women
! width=55|Total
|-
| align=left|Athletics
| 7 || 1 || 8
|-
| align=left|Boxling
| 1 || – || 1
|-
| align=left|Judo
| 0 || 2 || 2
|-
| align=left|Shooting
| 0 || 1 || 1
|-
| align=left|Swimming
| 1 || 0 || 1
|-
| align=left|Tennis
| 1 || 0 || 1
|-
| align=left|Weightlifting
| 1 || 1 || 2
|- class="sortbottom"
! Total || 11 || 5 || 16
|}
Athletics
In total, eight Ecuadorian athletes participated in the athletics events – Silvio Guerra, Xavier Moreno, Jefferson Pérez, Byron Piedra, Jackson Quiñónez, Sandra Ruales, Rolando Saquipay and Franklin Tenorio.