2023 Dundalk F.C. season

Dundalk entered the 2023 season having finished in third place in the league the previous season. 2023 was Dundalk's 15th consecutive season in the top tier of Irish football, their 88th in all, and their 97th in the League of Ireland. The club celebrated the 120th anniversary of its founding in September 2023. They entered the 2023–24 UEFA Europa Conference League at the first qualifying round stage in what was their 26th European campaign.

Stephen O'Donnell was the club's head coach going into the new term, his second season in charge.

Season summary
The league season consisting of 36 matches (four series of nine matches) began on 17 February 2023. In Round 22 away to Drogheda United, Pat Hoban scored his 143rd and 144th goals for the club to take him past Joey Donnelly's record of 142 set in 1946. He ended the season with 15 goals, to reach a total of 150 goals for the club. Having briefly entertained a title challenge following a home win over champions Shamrock Rovers in round 24, a poor run subsequently saw the club finish in 5th position and outside the European qualification places.

In the FAI Cup, they reached the quarter-final before losing away to First Division Galway United, 4–0 in a performance described as "embarrassing" by O'Donnell.

In the Leinster Senior Cup, they were initially ejected from the tournament for failing to fulfil a fourth-round tie against Shelbourne. That decision was overturned on appeal by the club but they exited the tournament anyway, losing the tie 4–0.

In the Europa Conference League, Dundalk reached the second qualifying round with a 3–1 aggregate win over Bruno's Magpies but were knocked out by KA, 5–3 on aggregate. Andy Boyle took the club record for appearances in Europe, playing his 41st match in the second leg against KA.

First-Team Squad (2023)
Sources: Note: Substitute appearances in brackets

First qualifying round
Dundalk won 3–1 on aggregate.

Second qualifying round
KA won 5–3 on aggregate.