Sligo Rovers will become the 10th club in the 2022 SSE Airtricity Women's National League, as their application has been approved by the FAI.
This means that next season will consists of 27 games for each side, as clubs face each other three times.
The Bit O' Red have been involved with the EA Sports Under-17 and Under-19 Women's National Leagues and will become the 16th different team to feature in the League since its inaugural season in 2011.
Sligo will play their home games at The Showgrounds, with female players being offered the same scholarships to IT Sligo as their male counterparts.
Shelbourne claimed their second title in dramatic circumstance last month, with an astonishing turnaround in the final round, as Shels beat Wexford at home and leaders and defending champions Peamount slumped to a 5-2 defeat away to Galway.
Both Shamrock Rovers and Treaty United have been given the green light to join the EA Sports Under-19 Women's National League having previously competed in the U-17 tier.
Two new clubs will debut in the U-17 League with Cobh Ramblers and Dundalk getting involved ahead of the 2022 season.
League of Ireland Director Mark Scanlon said: "After such a brilliant season, with records broken and new initiatives taking off, it is exciting to be welcoming a new club in Sligo Rovers to the SSE Airtricity Women's National League.
"Sligo Rovers have a long history in the League of Ireland of being successful on the pitch and progressive off it. I'm sure that they will add that same professional approach to their women's set-up, as has already been seen with their Women's Under-17 and Under-19 teams."
Sligo Rovers chairperson Tommy Higgins has welcomed a historic moment for the club.
"This is a hugely significant development for Sligo Rovers. It completes the pathway for our academy female teams and gives them the same opportunities as their male counterparts which is so important.
"We have been conscious that a club of our stature – which represents the north-west in senior football – have not been competing at senior level and as a result prioritised our entry into the WNL as quickly as possible.
"Our club is based on inclusivity and community. Our female team will receive the necessary support in order to grow and compete at a national level.
The fixtures for the 2022 SSE Airtricity Women's National League, Evoke.ie FAI Women's Cup and EA Sports Underage Women's National Leagues will be released before Christmas.