The Taoiseach is to formally recognise the ethnic status of the Traveller community in the Dáil for the first time.
The move follows discussions in Cabinet and a report from an Oireachtas committee earlier this year.
It is not thought that the decision will confer additional rights on Travellers but will rather formalise their status.
The move has been described as "historic" by the Traveller advocacy group Pavee Point.
Traveller organisations are expected to gather at Leinster House to mark the expected announcement by Enda Kenny.