The 1919–20 season was the 43rd 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.
There was an improvement from the previous season with an 11th-place finish out of 22, with 39 points, 32 behind champions Rangers.[1]
With the resumption of the Scottish Cup, Dumbarton were perhaps unfortunate to come up against Rangers in the first round. However they gave a good account of themselves, and lost a very close encounter by the only goal, after a 0-0 draw.
For the second successive season Dumbarton failed to progress from the sectional stage of the Dumbartonshire Cup.
Dumbarton won the Dumbartonshire Charity Cup by defeating Vale of Leven in the final.
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In addition Robert Carmichael, David Finnie, Val Lawrence, John McEwan, James McGregor, James McIntosh, James Neil, william Wilson and James Young all played their final 'first XI' games in Dumbarton colours.