The 1990–91 Scottish Cup was the 106th staging of Scotland's most prestigious football knockout competition. The Cup was won by Motherwell who defeated Dundee United F.C. in the final.
First round Home teamScoreAway teamThreave Rovers (NL) 1 – 2Spartans (NL)Whitehill Welfare (NL)0 – 4East Fife (3)Montrose (3)0 – 0Dumbarton (3)East Stirlingshire (3)1 – 3Queen of the South (3)Fraserburgh (NL)3 – 1Vale of Leithen (NL)Ross County (NL)1 – 1Alloa Athletic (3)
Replays Home teamScoreAway teamDumbarton (3)1 – 4Montrose (3)Alloa Athletic (3)1 – 3Ross County (NL)
Second round Home teamScoreAway teamRoss County (NL)2 – 2Queen of the South (3)Spartans (NL)0 – 0Cowdenbeath (3)Inverness Thistle (NL)1 – 1East Fife (3)Berwick Rangers (3)1 – 0Albion Rovers (3)Fraserburgh (NL)1 – 4Cove Rangers (NL)Montrose (3)0 – 2Arbroath (3)Queen's Park (3)1 – 2Stranraer (3)Stirling Albion (3)2 – 0Stenhousemuir (3)
Replays Home teamScoreAway teamQueen of the South (3)2 – 6Ross County (NL)Cowdenbeath (3)2 – 0Spartans (NL)East Fife (3)1 – 0Inverness Thistle (NL)
Third round Home teamScoreAway teamRangers (1)2 – 0Dunfermline Athletic (1)Ross County (NL)1 – 6Meadowbank Thistle (2)Clyde (2)0 – 2Hibernian (1)Aberdeen (1)0 – 1Motherwell (1)Airdrieonians (2)2 – 1Hearts (1)Clydebank (2)0 – 1Ayr United (2)Cove Rangers (NL) 1 – 2Cowdenbeath (3)Dundee (2)1 – 0Brechin City (2)East Fife (3)1 – 1Dundee United (1)Forfar Athletic (2)0 – 2Celtic (1)Kilmarnock (2)3 – 2Arbroath (3)Partick Thistle (2)0 – 0Falkirk (2)Raith Rovers (2)0 – 1Hamilton Academical (2)St Johnstone (1)0 – 0Berwick Rangers (3)Stirling Albion (2)0 – 1Greenock Morton (2)Stranraer (3)1 – 5St Mirren (1)
Replays Home teamScoreAway teamBerwick Rangers (3)3 – 4St Johnstone (1)Falkirk (2)4 – 3Partick Thistle (2)Dundee United (1)2 – 1East Fife (3)
Fourth round Home teamScoreAway teamGreenock Morton (2)3 – 0Meadowbank Thistle (2)Celtic (1)3 – 0St Mirren (1)Ayr United (2)0 – 0Hamilton Academical (2)Dundee (2)2 – 0Kilmarnock (2)Dundee United (1)2 – 0Airdrieonians (2)Motherwell (1)4 – 2Falkirk (2)Rangers (1)5 – 0Cowdenbeath (3)St Johnstone (1)2 – 1Hibernian (1)
Replay Home teamScoreAway teamHamilton Academical (2)2 – 3Ayr United (2)
Quarter-finals Home teamScoreAway teamCeltic (1)2 – 0Rangers (1)Motherwell (1)0 – 0Greenock Morton (2)St Johnstone (1)5 – 2Ayr United (2)Dundee United (1)3 – 1Dundee (1)
Replay Home teamScoreAway teamGreenock Morton (2)1 – 1 (4 – 5 pen.)Motherwell (1)
Semi-finals
Replay
Final
See also 1990–91 in Scottish football 1990–91 Scottish League Cup
References