Organisers estimate that crowds of over 20,000 converged at the GPO for the anti water charges protest.
Groups from areas all around the capital held protests in their localities, before converging for a march through the city centre.
Mary Smith is one of the organisers of the Dublin 14, 16, 18 group for Right2Water.
She thinks today's protest will help restore some of the momentum to the protests that was lost over the Christmas period:
These water protesters on St Stephen's Green have been telling us why they showed up today:
