Cork
Rap collective Kabin Krew will lead the St Patrick's Day festivities in Cork this afternoon.
The group of schoolchildren will act as Grand Marshalls for the event, which is due to feature 2,500 participants.
The parade will start at 1pm and travel from South Mall to Merchants Quay with a theme of "building a better world".
Belfast
Some people in Belfast are celebrating St Patrick's Day by going for a run.
The Spar Craic 10k event is taking place in Belfast this morning with participants travelling through the city centre before finishing in Ormeau Park.
The fun run started 10 years ago and aims to be the greenest race in the world.
Belfast's main parade will begin from City Hall at 1.30pm.
Galway
Over 30,000 people are expected to attend the St Patrick's Day Parade in Galway.
Irish musician Sharon Shannon will lead the festivities as Grand Marshal with 50 community groups taking part in the fun.
The parade will start at 11.30am from the University of Galway campus before finishing up at the Dyke Road Car Park.
This year’s theme is “Sea and Stone”, celebrating the Town of the Tribes’ unique location on the Atlantic coast.
Derry
A parade staged by the North West Carnival Initiative will have a "Forest, Sky and Sea" theme as Derry celebrates the arrival of spring.
The parade is due to get under way at 3pm.
A stage at Guildhall Square and the Guildhall’s Main Hall will host live traditional Irish music from 1pm-3pm featuring some of the best local musicians. There will also be live music in the Craft Village until 6pm.
Limerick
A crowd of up to 50,000 people is expected to watch the parade in Limerick city this afternoon, which has the theme "A more fun Limerick".
The parade starts at 12pm, but there's plenty going on in the run up to it including a ceili mór at the city's famous Milk market.
The tales of St Patrick storytelling event will take place at the Hunt museum and a big post-parade block party at Merchants Quay starts at 2pm.
Kilkenny
Award-winning band Kila will close out the St Patrick's Day parade in Kilkenny this afternoon.
Sixty floats will take to the city streets as part of the event which starts on John Street at 1.30pm.
Irish Olympian Mia Griffin will act as Grand Marshal with Ireland's Junior Eurovision entry Enya Cox Dempsey alongside her.
Festival organisers say the parade will be live streamed for those who can't attend this year.
Armagh
St Patrick’s Day celebrations started at dawn in the city which claims the “most authentic connection” with the national saint.
Now known as the ecclesiastical capital of Ireland, Armagh’s ties to Patrick stretch back to 445AD when he founded the first church.
Events started at daybreak at the Navan Centre and Fort which hosted the Dawn Light, an event which transported attendees back to the 5th century, through drama and live music, to witness Patrick’s fateful encounter with Chieftain Daire.
The festivities also include a colourful and musical parade later in the day.
Dingle
Ireland's earliest St Patrick's Day parade is already over.
Thirty members of the local fife and drum band took to the streets of Dingle in Kerry at 6am.
The tradition dates back to the Land War of the 1870s when British authorities banned gatherings between sunrise and sunset.
