Hundreds of thousands of people are expected to turn out for Patrick's Day events all over the capital today.
Traffic restrictions are in place on most parade routes and people are advised to plan their route before travelling.
The President Michael D Higgins will attend the Parade in the city centre which kicks off at 12.
Grand Marshall for the parade is Game Of Thrones star Liam Cunningham and he says it's an "extraordinary honour."
The International Guest of Honour for the parade is Star Wars actor Mark Hamill.
Anyone travelling to the St Patrick’s Day Parade in Dublin is asked to leave their car at home, or outside the M50 ring road.
Traffic restrictions will be in place across the capital, as hundreds of thousands of viewers come into the city.
Anyone attending the parade in Dublin this afternoon is advised to wrap up warmly!
Temperatures are set to plummet to around 1 degree in Dublin, with some snow possible.