Cardiff City Stadium will be the venue for the Pro14 final in June 2020.
The game will take place on 20 June and will be the first time Cardiff has staged the event since the competition took finals around the grounds in the 2009-2010 season.
Principality Stadium hosted the league final in 2003 when Munster defeated Neath 37-17.
“We have heard the voices of Welsh fans wanting to see the final here,” said Pro14 chief executive Martin Anayi.
“It’s great that all of the pieces have finally fallen into place for 2020.”
The Pro14 final has enjoyed four record attendances in a row with league bosses hoping the Cardiff City capacity of 33,280 will be filled.
The last four finals have been held in Celtic Park, Glasgow, two in the Aviva Stadium in Dublin and Edinburgh’s Murrayfield.
“Cardiff City Stadium also brings us to a football venue for the second year in a row after the tremendous success of our most recent final in Glasgow’s Celtic Park,” said Anayi.
“Although the stadium itself may be known for the round ball, Cardiff is one of the most attractive Rugby cities across the world.”
Former Cardiff Blues flanker and recently appointed new board member Sam Warburton backed the decision.
“We hope it’s not just the local fans who are excited, but everyone from around our competing nations and beyond.”
The Pro14 league season starts on 27 September.