The organisation, Fiji's Women's Rights Movement, says yesterday's court ruling to legitimise the 2006 coup is marginalising the voices and votes of the people.
Three judges threw out the challenge by the ousted prime minister, Laisenia Qarase, questioning the legality of the military takeover.
The organisation's director, Virisila Buadromo, says she's surprised by the ruling.
"We're quite concerned with what we heard yesterday, because it appears to have marginalised the votes and voices of all people of Fiji. However, we hope that an appeal will be filed and that the process of justice will continue."
Virisila Buadromo, the director of Fiji's Women's Rights Movement.
Laisenia Qarase described the ruling as a miscarriage of justice.