The 2024 League of Ireland First Division, known as the SSE Airtricity Men's First Division for sponsorship reasons, was the 40th season of the League of Ireland First Division. The competition began on 16 February 2024, and concluded in October 2024.
Cork City won the title for the third time.
The teams relegated to the First Division were Cork City (losers of the 2023 League of Ireland Premier Division play-off) and UCD (the bottom-placed team of the 2023 League of Ireland Premier Division). They replaced the two teams promoted from the 2023 League of Ireland First Division (champions Galway United and Premier Division play-off winners Waterford).
<small>Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.</small>
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Teams play each other four times (twice at home and twice away).
The ninth-placed team (Drogheda United) from the 2024 League of Ireland Premier Division qualified for a play-off alongside the second, third, fourth, and fifth-placed teams from the 2024 League of Ireland First Division (Athlone Town, Bray Wanderers, UCD, and Wexford).
The First Division teams contested the semi-finals and final. The semi-finals were held over two legs, with the second-placed team facing the fifth-placed team and the third-placed team facing the fourth-placed team. The semi-final winners then contested the First Division final, with the winners ultimately facing the ninth-placed League of Ireland Premier Division team for the final place in the 2025 League of Ireland Premier Division. Ultimately, Drogheda United won the play-off and remained in the Premier Division.
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