Public transport capacity will increase to 100% from next week, the Department of Transport has confirmed.
It has been operating at 75% due to COVID-19 restrictions.
However, full capacity is returning in line with the return of schools and the expected phased return to workplaces in the coming weeks.
A return to full public transport capacity was originally targetted for earlier in the summer.
That was delayed due to the emergence of the Delta variant.
Mask-wearing rules remain in place across Luas, Irish Rail and bus services.
The easing of capacity limits on public transport comes as ministers prepare to finalise their plan for the further reopening of the country.
The Taoiseach has said September will be a "significant month" that will see restrictions around live entertainment eased.
However, a major easing is not expected until the latter half of September, in order to allow a two-week gap after recently vaccinated people receive their second dose.
Ministers will sign off on the reopening roadmap at a meeting on Tuesday, with full details expected to be published shortly after.
Senior officials have already said Ireland's likely to move to a model based on "personal responsibility" rather than strictly enforced restrictions.
