Orange Order parades are taking place in each of the six counties.
Antrim: Antrim, Ballinderry, Portglenone, Ballymena, Broughshane, Bushmills.
Armagh: Killylea.
Down: Comber, Dromore, Kilkeel, Ballywalter.
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Fermanagh: Enniskillen.
Derry: Coleraine.
Tyrone: Dungannon, Castlederg, Aughnacloy.
The Belfast parade will be from Carlisle Circus in the city centre to Ormeau Park. The Independent Orange Order will hold its parade in Larne, Co Antrim.