The 23-year-old woman had a hot cup of tea thrown in her face as she went to assist homeless people sleeping outside the GPO on O’Connell Street.
The attack took place shortly after midnight when she and other volunteers from Inner City Helping Homeless were giving out food to homeless people.
Outreach volunteers took the appropriate measures of withdrawing all volunteers from the north and south side of the city, resulting in all outreach services being withdrawn from the city.
ICHH director, Anthony Flynn, condemned what he described as an “absolutely appalling” incident.
“It is uncalled for and unbelievable,” said Mr Flynn.
“The girl has been working with us for 10 months and would know the homeless community and have a relationship with them. To have a voluntary outreach worker assaulted in the course of her duties is just unacceptable.”
Mr Flynn said he was working with the gardaí regarding the situation but said he was far from happy that the attacker was not arrested on the spot.