1890–91 in Scottish football was the 18th season of competitive football in Scotland. This season saw the introduction of the Scottish Football League with ten teams competing.
League competitions
Scottish Football League
Dumbarton and Rangers were declared joint champions after drawing a play-off game 2–2 at Cathkin Park, Glasgow on 21 May 1891. Renton started the season as members of the Scottish Football League, but were expelled for professionalism (the game was still officially amateur at this stage). Also, Celtic, Third Lanark and Cowlairs were all docked four points for fielding ineligible players.
Other honours
Cup honours
National
{| class="wikitable" style="text-align: center;"
|-
!width=160|Competition
!width=135|Winner
!width=80|Score
!width=135|Runner-up
|-
|align=left| Scottish Cup
| Hearts
| 1 – 0
| Dumbarton
|-
|align=left| SFL Charity Cup
| Dumbarton
| 3 – 0
| Celtic
|-
|align=left| Scottish Junior Cup
| Vale of Clyde
| 2 – 0
| Chryston Athletic
|}
County
{| class="wikitable" style="text-align: center;"
|-
!width=160|Competition
!width=135|Winner
!width=80|Score
!width=135|Runner-up
|-
|align=left|Aberdeenshire Cup
|Orion
|4 – 1
|Caledonian
|-
|align=left|Ayrshire Cup
|Kilmarnock
|7 – 1
|Hurlford
|-
|align=left|Border Cup
| Selkirk
|4 – 3
| Hawick Rangers
|-
|align=left|Buteshire Cup
| Bute Rangers
|6 – 1
| St Blane's
|-
|align=left|Dumbartonshire Cup
|Dumbarton
|4 – 1
|Vale of Leven
|-
|align=left|East of Scotland Shield
|Hearts
|3 – 0
|Armadale
|-
|align=left|Fife Cup
|Cowdenbeath
|2 –1
|Lassodie
|-
|align=left|Forfarshire Cup
|Dundee Our Boys
|6 – 2
|Dundee East End
|-
|align=left|Glasgow Cup
|Celtic
|4 – 0
|3rd LRV
|-
|align=left|Lanarkshire Cup
|Airdrie
|2 – 1
|Albion Rovers
|-
|align=left|Linlithgowshire Cup
|Armadale
|2 – 0
|Bo'ness
|-
|align=left| North of Scotland Cup
| Camerons
| 4 – 2
| Inverness Union
|-
|align=left|Perthshire Cup
|Dunblane
|4 – 2
|St Johnstone
|-
|align=left|Renfrewshire Cup
|St Mirren
|4 – 0
|Port Glasgow Athletic
|-
|align=left|Stirlingshire Cup
|East Stirlingshire
|4 – 1
|Grangemouth
|}
Edinburgh Exhibition
The Edinburgh Exhibition Contest was held to coincide with the 112th International Exhibition held at Meggetland, Edinburgh.
Rather than a one-off tournament, a series of nine games were arranged. The Edinburgh Evening Dispatch newspaper awarded silver cups to the winners of each match.