1999–2000 League of Ireland First Division

League of Ireland First Division
Season1999–2000
ChampionsBray Wanderers
PromotedLongford Town
Kilkenny City
Top goalscorerRobbie Farrell: 17
(Home Farm Fingal)
Andrew Myler: 17
(Monaghan United)
Keith O'Connor: 17
(Longford Town)

The 1999–2000 League of Ireland First Division season was the 15th season of the League of Ireland First Division.