| Club: | Dumbarton |
| Season: | 1970–1971 |
| Manager: | Jackie Stewart |
| Stadium: | Boghead Park, Dumbarton |
| League: | Scottish League Division 2 |
| League Result: | 4th |
| Cup1: | Scottish Cup |
| Cup1 Result: | Second round |
| Cup2: | Scottish League Cup |
| Cup2 Result: | Semi-final |
| League Topscorer: | Kenny Wilson (29) |
| Season Topscorer: | Kenny Wilson (40) |
| Prevseason: | 1969–70 |
| Nextseason: | 1971–72 |
The 1970–71 season was the 87th football season in which Dumbarton competed at a Scottish national level, entering the Scottish Football League, the Scottish Cup and the Scottish League Cup. In addition Dumbarton competed in the Stirlingshire Cup.
See main article: 1970–71 Scottish Football League. Dumbarton had their best league campaign in over 10 years - including an unbeaten home record - the first for over 30 years, although with only 4 wins in 18 away matches, in the end it became a case of 'catch-up' - 8 wins in their last 10 games not being enough to challenge the leaders. Nevertheless, it was a creditable 4th-place finish, with 44 points, 12 behind champions Partick Thistle.
See main article: 1970–71 Scottish League Cup. Five wins and a draw from the six sectional games meant an easy section qualification. Then Partick Thistle were dispatched in the quarter-final, with the mighty Celtic waiting in the semi-final - and it was only after an extra time 0-0 draw that Dumbarton eventually succumbed by the odd goal in seven in the replay again after extra time.
In the Scottish Cup, Dumbarton had a disappointing second round loss to Stranraer.
See main article: 1970–71 Scottish Cup.
Locally, in the Stirlingshire Cup, Dumbarton were knocked out in the first round by Clydebank.
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Source:[1]
Amongst those players joining and leaving the club were the following
| Player | From | Date | |
|---|---|---|---|
| Peter Coleman | Albion Rovers | 1 May 1970 | |
| Charlie Gallagher | Celtic | 18 Jun 1970 | |
| Brian Gallagher | Morton | 21 Jul 1970 | |
| Kenny Wilson | St Johnstone | 21 Jul 1970 | |
| Jack Bolton | Raith Rovers | 4 Sep 1970 | |
| Tom McAdam | 'S' Form |
| Player | To | Date | |
|---|---|---|---|
| David Anderson | Berwick Rangers | 9 Oct 1970 | |
| Eddie Ferguson | Rotherham Utd | 29 Jan 1971 | |
| Allan Watson | Emigrated |
Source:[2]
For the first time in eight years, Dumbarton played an official reserve team which competed in the Combined Reserve League. The league was played in two series, and reporting of results is scarce - but both series were won by Partick Thistle.