About 17,000 members are expected to take part in parades at six locations in Northern Ireland.
The parade was last held in Lisburn in August 2015.
There will be six districts taking part: Lisburn, Ballymena, Antrim, Larne, Ballymoney and Ballyclare.The main parade will begin at 12:30 BST, there will be a religious ceremony at Wallace Park at 15:00, with the return parade at 16:15.A demonstration is being held at Loughgall, home to the headquarters of the Royal Black Institution
Summerisland RBDC No 6 are hosting the demonstration in the County Armagh village, home to the headquarters of the Royal Black Institution. Sixty bands will be on parade, with an estimated 4,000 participants in the procession, which will take in Ballygassey Road, Main Street and Old Road.County Londonderry will parade in Moneymore for the first time since 1997.A total of 35 preceptories and 31 bands - an estimated total of 1,000 participants - will gather on the Desertmartin Road from 11:00 and walk the one-mile route to the field on the Moneyhaw Road.
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