2023 University College Dublin A.F.C. season

The 2023 University College Dublin A.F.C. season started on 4 February when UCD lost to Shamrock Rovers in the Leinster Senior Cup. They were officially relegated to the 2024 LOI First Division on 22 September.

Season review
UCD's season started on 4 February when UCD lost to Shamrock Rovers 4–1 in the Leinster Senior Cup. Their first LOI Premier Division match was on 17 February against Dundalk. They failed to win any of their first 9 Premier Division matches (17 February – 10 April). Their first win was on 14 April against Cork City. However, they would go another 10 matches without a win (22 April – 9 June). Their second win came against Sligo Rovers on 23 June. Their third win came in the first round of the FAI Cup when they defeated Cobh Ramblers to advance to the second round. They lost to Galway United in the second round of the FAI Cup. UCD were officially relegated to the 2024 LOI First Division on 22 September after a 0–0 draw against Shamrock Rovers.