Taoiseach Leo Varadkar has said he believes it is only a matter of time before same-sex marriage is introduced in Northern Ireland.
He was speaking at a Prideevent in Belfast ahead of the main Pridemarch which was held this afternoon.
Mr Varadkarsaid he was attending the event as a gesture of solidarity.
"I am not here to unsettle anyone, but I am here to show my support and the support of my Government for equality before the law for all citizens no matter where they reside," hetold journalists on his way in to the event.
Campaigners have stepped up their calls for Northern Ireland to overturn the restriction against same-sex marriage.
Mr Varadkar said: "It is of course a decision for the Northern Ireland Assembly, but I am confident that like other western European countries they will make that decision in due course."
PSNIand Garda officers also joined Mr Varadkar at the event, arriving in a PSNI Land Rover.
For the first time uniformed officers marchedin the Pride parade through the city centre.
Assistant Chief Constable Barbara Gray said the PSNI's participation in the breakfast and parade "is about inclusion and representation".
"We represent all sections of society. Members of the LGBT community are a marginalised community in Northern Ireland," she said.
Sheadded that the PSNI's presence at the events might encourage victims of hate crime to come forward and report them.