Organisers say 12,500 people are marching as part of Dublin's Pride parade, including members of the LBGTQ+ community, their families and friends.
There are 280 different organisations involved with floats from companies showing their support alongside rainbow flags and colours flying proudly.
Dublin City Council had said it expected over 100,000 people to be in the capital for this year's Dublin Pride March and Parade.
The organisers described the event as a milestone anniversary year as it celebrates ten years of marriage equality.
In his last year as President, Micheal D Higgins sent a message to all those participating in Pride and wished them his "warmest greetings".
He said the celebration is "a vital affirmation of the rights, dignity and joy of our LGBT+ communities".
President Higgins said Pride is a time to "remember with gratitude the courage of those who paved the way for progress when marching was not safe, who gave voice to truths that were long silenced and who set the foundations for the inclusive Ireland that we continue to strive towards today".
Former senator David Norris said he was delighted to be at Pride.
The 81-year-old said he was at the first pride parade with just eight other people and that it was wonderful to see so many people attending this edition of Pride.
The main event of Pride is a parade through the city centre which started at 12.30pm, led by Taoiseach Micheál Martin.
The Taoiseach said it was a particular honour to lead the parade, which he said was full of "jubilation and joy".
Watch: Festival Director says Pride is all about 'championing equality'
Mr Martin said it was particularly heartwarming to see neighbourhoods share the joy as the parade passed through the city.
He said it showed "Irish people are fully inclusive and fully believe that no individual group should be left behind".
The Taoiseach said he was thinking of the people of Hungary, where the Pride March in its capital is banned while gay rights are also under threat.
Watch: Thousands gather to celebrate Dublin Pride festivities
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Speaking to the crowd from the stage in Merrion Square, he said he was "struck by how our streets are alive with colour, with laughter, with joy, and - most appropriately - with pride".
He said: "These attributes have become synonymous with the Dublin Pride Parade since its inception, and it’s heartwarming to see the strength of the celebrations across the city."
The parade lasted for around two hours with both sides of the main thoroughfare full with seven different assembly zones for the many groups and organisations involved.
The parade moved from O’Connell street at around 12.30pm, then made its way along Eden Quay and Custom House Quay before crossing the Talbot Memorial Bridge and then heading up Lombard Street and Westland Row before it finished at Merrion Square.
There will also be a festival at Pride Village at Merrion Square.
The non-ticketed alcohol-free event will have food stalls and a main stage for speeches and music acts throughout the afternoon.
Organisers said there are 12,500 individuals registered to march in the parade - from 280 different organisations.
Thousands of members of the LGBTQ+ community and their families and friends participated and lined the parade's route.
Festival Director Jed Dowling said this year's theme is about "taking liberties" and that the fundamental freedoms people fought for were taken, not given.
He said the LGBTQ+ community fought hard for decades and that it is only right that the parade starts on O'Connell street, under the monument of Daniel O'Connell, who he said was the original "Liberator".
Road closures are in place and public transport will be affected by Pride.
There are accessibility supports available for people who need them, including a quiet area and a quieter bus for those with neurodivergent participants.
There are a number of pride activities running throughout the weekend, including lots of arts and cultural events.
Read more: What to know ahead of the Dublin Pride Parade 2025