A Louise Quinn header was enough to earn Vera Pauw's side the friendly win.
A second-half header from Louise Quinn secured a historic win for the Republic of Ireland as they overcame Australia 3-2 at Tallaght Stadium.
Vera Pauw's snapped a losing streak by recording this deserved victory in front of 3,314 supporters at Tallaght Stadium against a team who finished fourth at the Tokyo Olympics.
It is Ireland's biggest win over a higher-ranked opponent in over two decades and they set off to achieve it straight away with Amber Barrett unleashing a stinging shot inside two minutes.
Australia barely had a chance to catch their breath when debutant Lucy Quinn curled a powerful free-kick at goal, which struck the post and rebounded in off goalkeeper Mackenzie Arnold.
The game was back and forth in many ways but Ireland were never outclassed by a team led by star striker Sam Kerr, who was marking her 100th appearance.
Mary Fowler twice got the visitors back into the contest, albeit with a bit of luck, but Ireland also profited when a strike from Denise O'Sullivan was deflected in.
At the end of a thrilling first half, it was 2-2 but Ireland will have felt that they were slightly on top. And they continued to play with confidence in the second period.
Louise Quinn powered in a header early in that half to reassert a lead that they would not surrender as Pauw's team showed how recent performances against top-quality opponents stood to them.
Ireland, who were roared on by a vocal crowd, finished the game by battling for every ball and proving that they belonged in competition against such a good team.
Next up is their 2023 FIFA Women's World Cup campaign, starting at home to Sweden on October 21st.
Republic of Ireland: Brosnan; Fahey, Louise Quinn, McCarthy; O’Gorman, McCabe; Finn (Caldwell 90), O’Sullivan, Barrett (Farrelly, 60); Payne (Kiernan 90), Lucy Quinn (Whelan 72).
Australia: Arnold (Williams HT); Polkinghorne, Kennedy (Checker HT), Nevin (Beard 68); Yallop (Gant 68), Logarzo (Wheeler 53), Cooney-Cross, Catley; Gielnick, Kerr, Fowler.
Referee: Paula Brady (Ireland).
Third Time The Charm As Laois Claim Joe McDonagh Cup
Offaly Pupils Become Local Stars After Publishing Bestselling Book
Katie Taylor To Fight At Croke Park In September
Laois And Westmeath Set For Big Tests In Intermediate Camogie Championship
I Knew I Had To Play A Good Round To Win - Ella Cantwell
Mullingar Athletic And Clonaslee United To Clash In Combined Counties Cup Final
Shane Lowry And Rory McIlroy In Contention At Memorial Tournament
There's Serious Competition In The Laois Panel - Mark Dowling
Westmeath Ladies Look To Book All-Ireland Quarter-Final Spot
Alex Dunne Aiming For Big Weekend In Monaco
Offaly Camogie Captain Looking Forward To Kilkenny Clash
Shane Lowry In Action At Memorial Tournament
Laois Aiming To Make It Third Time Lucky In Joe McDonagh Cup Decider
Galway To Host Westmeath On Sunday June 14th
Second Round Draw Made For FAI Cup
Cian Reddy Keeps Up Unbeaten Professional Record
Westmeath Ladies Get Opening Win In All-Ireland Intermediate Championship
Athlone Town Knocked Out Of All-Island Cup
Limerick See Off Offaly In Senior Camogie Championship
Athlone Town Suffer Defeat Away To UCD In First Division