1990–91 League of Ireland Premier Division
|European Cup||Dundalk F.C.|
|UEFA Cup||Cork City|
|UEFA Cup Winners' Cup||Galway United|
The 1990–91 League of Ireland Premier Division was the sixth season of the League of Ireland Premier Division. The Premier Division was made up of 12 teams.
The Premier Division was contested by 12 teams and Dundalk F.C. won the championship.
|1||Dundalk F.C.||52||22||8||3||52||27||+25||Qualified for 1991–92 European Cup|
|2||Cork City F.C.||50||19||12||2||45||18||+27||Qualified for 1991–92 UEFA Cup|
|3||St Patrick's Athletic F.C.||44||17||10||6||46||21||+25|
|5||Sligo Rovers F.C.||38||13||12||8||34||22||+12|
|6||Shamrock Rovers F.C.||37||14||9||10||51||37||+14|
|7||Derry City F.C.||35||13||9||11||51||28||+23|
|8||Galway United F.C.||23||9||5||19||34||61||-27||Qualified for 1991–92 European Cup Winners' Cup|
|10||Athlone Town A.F.C.||19||6||7||20||22||53||-31|
|11||Waterford United F.C.||17||6||5||22||22||62||-40||Relegated to First Division|
|12||Limerick City F.C.||17||6||5||22||21||73||-52||Relegated to First Division|
- Galway United F.C. qualified for the 1991–92 European Cup Winners' Cup after winning the 1990–91 FAI Cup final.