Dublin Simon Community says 25% of its emergency beds are occupied by employed people.
The organisation says on one night this month, 33 of the 129 beds were occupied by workers, including healthcare assistants, retail staff, taxi drivers, scaffolders and electricians.
It says it's seeing an increasing number of working people with nowhere to live.
A statement from Dublin Simon Community says: "Staff at Dublin Simon Community emergency services are reporting increasing numbers of working people with nowhere to live and requiring emergency beds.
"On one night in June, 33 of Dublin Simon’s emergency beds were occupied by workers out of a total of 129 emergency beds. The cohort of workers affected included cleaners, event and retail security staff, taxi drivers, van drivers and lorry drivers, scaffolders, electricians and construction workers, healthcare assistants and carers, shop workers and retail staff, barbers and bar workers.
"The growing phenomenon can be attributed to a constellation of factors, including the scarcity of suitable accommodation, soaring rents, the wider cost-of-living crisis, and notices to quit coming to the end of their term. The individuals impacted report attending viewings where hundreds of people were vying for the same room or property for rent.
"Single people are at a distinct disadvantage as they lack access to a combined income, making them even more susceptible to homelessness. "
Senior Manager of Emergency Services at Dublin Simon Community, Niamh Brennan says: "These people are getting up in the morning, doing a full day’s work and then making their way to emergency accommodation to try to get some rest.
"It is deeply demoralising for those who are working to have to rely on emergency beds in homeless services to lay their head down at night.
"Single men are overrepresented in homelessness demographics and are being overlooked and neglected in the national discourse. It is our view that every person experiencing homelessness matters and deserves an exit from homelessness."