The 1920–21 season was the 44th Scottish football season in which Dumbarton competed at national level, entering the Scottish Football League and the Scottish Cup. In addition Dumbarton entered the Dumbartonshire Cup and the Dumbartonshire Charity Cup.
Scottish League
Dumbarton witnessed a slump in form finishing in 21st-place out of 22, with 24 points, well behind champions Rangers. In addition to an outflow of some of the team's talent, the inability to score was also a problem, and with just 41 goals to their credit, Dumbarton finishing up as lowest scorers in the league.
Promotion/relegation Election The bottom two clubs - Dumbarton and St Mirren - retained their places in the Scottish League. Although the Scottish Second Division had not yet reformed, there was one applicant for promotion - Central League champions, Dunfermline Athletic. However they failed to find a proposer and seconder in the vote.
Scottish Cup
Dumbarton reached the fourth round before losing out to Rangers.
Dumbartonshire Cup Dumbarton again failed to progress from the sectional stage of the Dumbartonshire Cup.
Final league table
Dumbartonshire Charity Cup Following a draw with Vale of Leven in the semi-final, a replay date could not be arranged and Dumbarton agreed to scratch from the competition.
Friendlies
Player statistics Squad
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Transfers
Players in PlayerFromDate Peter Brown Renton 2 May 1920 John Browning Vale of Leven 2 May 1920 Thomas Maxwell Dumbarton Harp 28 May 1920 Peter Currie Clyde 15 Jun 1920 Percy Wharrier Dumbarton Harp 23 Jun 1920 George Rae Dunfermline Athletic 7 Aug 1920 Archibald Mackie Kilmarnock 14 Aug 1920 Thomas Mannion Duntocher Hibs 8 Sep 1920 William Fraser Kirkintilloch Rob Roy 9 Sep 1920 Harry Chatton Kirkintilloch Rob Roy 22 Sep 1920 John McTavish East Fife (loan) 22 Oct 1920 Ernest Somerville Clydebank 24 Oct 1920 Eli Cotterill Chesterton (loan) 18 Nov 1920 John McMillan Duntocher Hibs 3 Dec 1920 Arthur Early Third Lanark 14 Dec 1920 Donald Colman Aberdeen 28 Dec 1920 Andrew Chalmers Girvan 15 Feb 1921
Players out PlayerToDate Alexander Thom Morton 25 May 1920 Alex Bennett Albion Rovers 19 Jul 1920 George Rae Dunfermline Athletic 23 Oct 1920 Archibald Mackie Clydebank 5 Jan 1921 Peter Currie East Stirling 28 Jan 1921 Peter Brown Renton 29 Jan 1921 Duncan Walker St Mirren 8 Apr 1921 James Scott Third Lanark 29 Apr 1921 John Duffus Millwall 20 May 1921 Scott Duncan Cowdenbeath (loan) Alfred Gettins Kings Park Charles Gordon Johnstone John Hagan Dumbarton Harp James Martin Bo'ness Thomas Maxwell Dunfermline Athletic Bob McGrory Burnley Patrick O'Connell Ashington John McMillan Renton Patrick O'Connell Ashington John Rowan Hamilton Finlay Speedie Dumbarton Harp
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References