League of Ireland 1998–99

League of Ireland Premier Division
Season	1998–99
Champions	St Patrick's Athletic
Relegated	Bray Wanderers Dundalk F.C.
UEFA Champions League	St Patrick's Athletic
UEFA Cup	Cork City Bray Wanderers
UEFA Intertoto Cup	Shelbourne
FAI Super Cup	St Patrick's Athletic Shelbourne Cork City Bray Wanderers
Top goalscorer	Trevor Molloy: 15 (St. Patrick's Athletic)
← 1997–98 1999–2000 →

The 1998–99 League of Ireland Premier Division was the 14th season of the League of Ireland Premier Division. The division was made up of 12 teams. St Patrick's Athletic F.C. won the title.

The season saw each team playing three rounds of games, playing every other team three times, totalling 33 games.

Bohemians who finished in tenth place played off against Cobh Ramblers, the third placed team from the 1998–99 League of Ireland First Division.

Bohemians won 7–0 on aggregate and retained their place in the Premier Division.