season started on 4 February when Shamrock Rovers defeated University College Dublin in the Leinster Senior Cup.
Shamrock Rovers had won the previous three Premier Division championships coming into the 2023 season (2020, 2021, and 2022).
[6] Shamrock Rovers faced Derry City on 3 March at Tallaght Stadium in Dublin[8] in front of 7,626 supporters.
[8] Shamrock Rovers faced Cork City on 6 March at Tallaght Stadium in Dublin[10] in front of 4,028 supporters.
[10] Rory Gaffney, Lee Grace, Simon Power, and Seán Hoare scored for Shamrock Rovers.
[10] Shamrock Rovers faced Shelbourne on 10 March at Tolka Park in Drumcondra, a suburb or Dublin[12] in front of 4,378 supporters.
[12] Shamrock Rovers faced St Patrick's Athletic on 17 March at Tallaght Stadium in Dublin[14] in front of 7,674 supporters.
[17] Shamrock Rovers won 4–0 with goals from Rory Gaffney, Lee Grace, Johnny Kenny, and Graham Burke.
[18] Shamrock Rovers took on Bohemians on 7 April at Dalymount Park in Dublin[19] in front of 4,290 supporters.
[21] Shamrock Rovers faced Shelbourne on 14 April at Tallaght Stadium in Dublin[23] in front of 6,835 supporters.
[23] Shamrock Rovers faced St. Patrick's Athletic on 21 April at Richmond Park in Dublin[25] in front of 5,,011 supporters.
[35] On 19 May, Shamrock Rovers faced St. Patrick's Athletic at home at Tallaght Stadium in Dublin[37] in front of 6,212 supporters.
[41] On 2 June, Shamrock Rovers faced Dundalk at Tallaght Stadium in Dublin[42] in front of 5,602 supporters.
[47] On 26 June, Shamrock Rovers faced Bohemians at Dalymount Park in Dublin[49] in front of 4,370 supporters.
[49] Shamrock Rovers faced Derry City on 26 June at Tallaght Stadium in Dublin[51] in front of 5,824 supporters.
[57] On 11 August, Shamrock Rovers faced Shelbourne at Tolka Park in Drumcondra[59] in front of 4,250 supporters.
[65] Lee Grace, Ronan Finn, and Neil Farrugia scored for Shamrock Rovers.
[67] Shamrock Rovers got their goal from Graham Burke from a penalty kick and Cameron McJannett scored for Derry City.
[68] The draw meant Shamrock Rovers extended their lead over Derry City at the top of the table and University College Dublin confirmed their relegation to the 2024 LOI First Division.
[72] Graham Burke scored the only goal of the match then was sent–off after receiving a second yellow card "moments after putting his side ahead".
[73] Shamrock Rovers won the match 5–0 with goals from Trevor Clarke, Richie Towell, Neil Farrugia, and Markus Poom.
[74] Shamrock Rovers played St. Patrick's Athletic on 27 October,[75] came away with a 2–0 win,[76] which was enough to clinch them their 4th Premier Division title in a row.
Source: Premier Division results Shamrock Rovers entered the first round of the 2023 FAI Cup.
[91] Bray wanderers got goals from Conor Davis, who scored from a penalty kick, and Joseph Power.