Brexit and drug abuse on agenda
Chief Minister Howard Quayle and Health Minister David Ashford are in Dublin for the 33rd British-Irish Council summit.
Irish Taoiseach Leo Varadkar is hosting the gathering at Phoenix Park.
Representatives from England, Scotland, Wales and the Channel Islands are attending.
There are no representatives from Northern Irish parties due to the political deadlock at Stormont.
SNP leader Nicola Sturgeon and Northern Ireland Secretary Julian Smith are in Ireland at the meeting.
Smith is a last minute replacement for Cabinet Minister Michael Gove.
The British-Irish Council was established as part of the Good Friday Agreement which signalled an end to 30 years of violence in Northern Ireland.
At the 20th anniversary meeting, the main topics are Brexit and tackling drug abuse.