The group is considered to be one of the most powerful at Leinster House.
A Laois Offaly TD has been appointed chair of the Oireachtas Public Accounts Committee.
Sinn Fein's Brian Stanley's will take over the role from his constituency colleague Fianna Fail's Sean Fleming.
The group is considered to be one of the most powerful at Leinster House.
TDs get a €9,500 euro boost to their salary for taking on the position.
Seventeen committees are due to be set up in the coming weeks with control to be divided between government and opposition.
Statement from Sinn Fein:
Sinn Féin President Mary Lou McDonald TD has appointed Brian Stanley TD as the new Chair of the Public Accounts Committee.
Teachta McDonald said: "I am very pleased to announce that I am appointing Brian Stanley TD as the new Chair of the Public Accounts Committee. This is the first time a Sinn Féin TD has held this important role and is reflective of the change that people voted for in February's election.
"Brian brings an immense wealth of experience to this position and I have no doubt he will do an excellent job in his new role. He has held elected office at local and national level for over two decades, represented Laois and Offaly with distinction, and has risen to the challenge of every position he has held.
"The PAC plays a very important role in providing vital oversight of public expenditure. This is more important than ever before, as we face the unprecedented challenges in trying to rebuild the economy in a way which delivers a fair recovery for all at a time of crisis caused by the Covid-19 pandemic.
"The PAC needs to keep an active watch on the public purse, to hold the government to account and to ensure that we see a benefit to society for every single euro of taxpayers money spent.
"I want to wish Brian the very best in his new role."
Outdoor Event Space Will Boost Laois' Night Time Economy - Fine Gael
Good Things Happen When You Get A Group Of Committed People - Castlepollard Local Development
60km Memorial Walk Starting In Westmeath This Weekend
Car Parking Costs Add Unnecessary Stress To Cancer Treatment Patients - LARCC
Laois Gardaí Investigating Stolen Car
Thousands Of Westmeath Homes Told Not To Consume Tap Water
Under-Utilised Facility Could Get New Education And Training Centre
Most Of The Country Lives Within 300 Metres Of A Licenced Premises
HSE Funding Insufficient For Midlands Population Growth - Sinn Féin
"A Wonderful Husband, Father And Friend" - Mark Walsh Remembered At His Funeral
Rock Legends 'The Cult' To Headline Forest Fest
"A Huge Relief" Parent Reacts To Return Of Nurse To MRHM
Motorist In Westmeath Clocked Speeding On National Slow Down Day
Plans Submitted For Over 100 Offaly Homes
Midlands Student Among Winners At Prestigious Trad Music Awards
Midlands Man Who Died In Workplace Incident To Be Laid To Rest Today
'Exceptional' Nurse To Return To MRHM Paediatric Diabetes Service
Children's Health Ireland Disputing Stats On Cancellations
Support The Bees For 'No Mow May' - Offaly County Council
10 Year Masterplan For Derryounce Lakes and Trails Nearly Set