There are security measures in place to make sure touts don't resell the tickets.
500,000 tickets have been made available today for the pope's visit to the Phoenix Park, and an additional 45,000 tickets are available for his visit to Knock in County Mayo.
Pope Francis will be in Ireland on the Saturday 25 and Sunday 26 August to attend the Catholic World Meeting of Families (WMOF) in Dublin's Croke Park, and to celebrate the closing mass of the gathering at the Phoenix Park.
He is also due to visit the Marian Shrine where he will recite the Angelus.
People are told to be aware that while voluntary contributions are welcomed at the time of buying the tickets online, all tickets are actually free, so any touts or resellers should be reported to the Gardaí.
Speaking on RTÉ's Morning Ireland, Media and Communications Manager for WMOF Brenda Drumm said that the demand has already been high, and that tickets are allocated on a first come first serve basis.
For those looking to get tickets, you can head to
worldmeeting2018.ie.
