Over 3,000 Orangemen representing upwards of 60 lodges will take part in the Twelfth in Coleraine.
The host district Macosquin will bring the parade to the town for the second time in three years and a huge crowd is expected to enjoy the festivities.
Holidaymakers on the north coast are expected to swell the numbers as they turn out to savour the atmosphere of a Twelfth parade.
As is traditional, members of Macosquin District will be joined by brethren from Coleraine, Londonderry city, Limavady, as well as County Donegal.
Over 50 bands will add to the carnival atmosphere.
On parade will be a new bannerette honouring Orangemen from Co Londonderry who were murdered during the Troubles. Dungiven LOL 2036 will also be carrying their new banner.
Ballarena Faith Defenders LOL 984 and Ballarena Accordion Band are both celebrating their 70th anniversary this year.
The Twelfth parade also takes place following the opening of a new Orange heritage centre in nearby Limavady, documenting the history – and showcasing artefacts – of the Institution in the locality.
The main procession will move off at 12 noon from Union Street and proceed through the town via Railway Road, Kingsgate Street, Long Commons, Beresford Road, Blindgate Street, Dunmore Street, New Row, Church Street, The Cenotaph, The Diamond, Queen’s Street, Circular Road, Old Bridge, Waterside, Castlerock Road, Kings Road and Carthall Road to the field.
At the field, the religious service will commence at 2.30pm. The address will be delivered by Rev John Noble, a Grand Chaplain of the Grand Orange Lodge of Ireland. The main speaker will be Samuel Calvin, Deputy County Grand Master of County Londonderry.