8,313 people were recorded as homeless in January.
It marks a slight rise on the figures recorded in December when 8,200 required emergency accommodation.
The latest data from the Department of Housing includes 2,326 children who did not have a home in the first month of the year.
Focus Ireland has expressed concern over the rise as the covid-19 eviction ban had led to a significant reduction in homelessness.
The charity says Dublin accounts for around 75 percent of the total homeless population of Ireland.
Focus Ireland Director of Advocacy Mike Allen says "The return to an increase in the monthly homeless figures is deeply concerning, particularly in the middle of a pandemic and Level 5 lockdown."
He's warned that "there are sharp divergences across regions and household types – homelessness among single people in Dublin has continued to rise since before the pandemic and continued to rise during it."