Flowers were laid at five separate plots in Glasnevin Cemetery, in memory of the women who died in Magdalene laundries.
A special ceremony in honour of the women was held at the graveyard.
Several hundred people came to the event, which was organised by the Justice for Magdalenes Research group.
Spokesperson Claire McGettrick said there are seven known plots in Glasnevin where Magdalene women are buried.
She said it is estimated that the remains of up to 400 women were buried in the graveyard, but many of their identities remain unknown.
The women were from laundries in High Park, Drumcondra and Sean MacDermott Street in Dublin.
The institutions were run by the Sisters of Our Lady of Charity.
Speaking in Glasnevin cemetery today, Sinn Féin's Mary Lou McDonald said: "We mark as a matter of respect the passing of the women incarcerated in the Magdalene laundries who are buried here.
"There is an issue around the McAleese Report, around the Commission of Investigation, around the story that has not yet been told.
"We are still waiting to hear the full story of the Magdalene laundries and the Mother and Baby Homes. There is a lot of work that needs to be done."