Walks took place in hundreds of locations in Ireland and 14 other countries.
Tens of thousands of people have taken part in Darkness Into Light events to raise funds for the suicide and self-harm prevention charity Pieta.
Beginning at 4:15am, people participated in walks, runs and swims across Ireland and around the country.
One of the biggest walks was held in the Phoenix Park in Dublin, where up to 10,000 participated in a 5km walk as the sun rose.
Dublin Bus offered a free shuttle service from Phoenix Park until 6am.
Outside Ireland, events took place in New Zealand, Australia, Hong Kong, Poland, Belgium, Luxembourg, The Netherlands, Switzerland, Spain, Gibraltar, the UK and South Africa.
Walks will also take place in Canada and the United States later in the day.
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Darkness Into Light first began in 2009, when 400 people took part in a walk in the Phoenix Park to raise money for Pieta.
Last year, €4.5 million was raised through events, which helped to fund 156 helpline hours, 10,956 crisis counselling sessions and 6,123 therapy sessions.
Darkness Into Light organiser Sharon Murphy previously told Newstalk said the walk lets her remember her husband who died 19 years ago - and support others.
“Without that service, I think we could have a lot more unnecessary deaths,” she said.
“If I can reach one person once a year by just being there, and even comfort people who lost someone to suicide, to me that’s huge.”
Pieta House contact lines:
24-hour freephone crisis helpline: 1800 247 247
Therapy Services team: 0818 111 126
Text counselling: Text HELP to 51444