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. For sponsorship purposes, it was known as the FAI Harp Lager National League.
|Pos||Team||Pld||W||D||L||GF||GA||GD||Pts||Qualification or relegation|
|1||St Patrick's Athletic (C)||33||22||7||4||58||21||+37||73||Qualification to Champions League first qualifying round|
|2||Cork City||33||21||7||5||62||25||+37||70||Qualification to UEFA Cup qualifying round|
|3||Shelbourne||33||13||8||12||37||35||+2||47||Qualification to Intertoto Cup first round|
|10||Bohemians (O)||33||10||7||16||28||37||−9||37||Qualification to Relegation play-off|
|11||Bray Wanderers (R)||33||8||8||17||30||45||−15||32||Relegation to League of Ireland First Division and |
qualification to UEFA Cup qualifying round[a]
|12||Dundalk (R)||33||6||9||18||23||40||−17||27||Relegation to League of Ireland First Division|
(C) Champion; (O) Play-off winner; (R) Relegated
- 1st Leg
- 2nd Leg
- "Ireland - List of Topscorers". www.rsssf.com. Archived from the original on 6 April 2012. Retrieved 6 July 2016.
- Graham, Alex. Football in the Republic of Ireland a Statistical Record 1921–2005. Soccer Books Limited. ISBN 1-86223-135-4.
- "(Republic of) Ireland League Tables". www.rsssf.com. Archived from the original on 21 February 2008. Retrieved 6 July 2016.
- "(Republic of) Ireland League Tables - Second Level". www.rsssf.com. Archived from the original on 3 June 2009. Retrieved 10 July 2016.