| Club: | Dumbarton |
| Season: | 1969–1970 |
| Manager: | Jackie Stewart |
| Stadium: | Boghead Park, Dumbarton |
| League: | Scottish League Division 2 |
| League Result: | 7th |
| Cup1: | Scottish Cup |
| Cup1 Result: | First round |
| Cup2: | Scottish League Cup |
| Cup2 Result: | Quarter-final |
| League Topscorer: | Roy McCormack (13) |
| Season Topscorer: | Kenny Jenkins/Roy McCormack (18) |
| Prevseason: | 1968–69 |
| Nextseason: | 1970–71 |
The 1969–70 season was the 86th 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: 1969–70 Scottish Football League. Although the league campaign saw a great improvement from the previous season, the inability to take points from the 'front-runners' meant that Dumbarton were never really in with a chance of snatching a promotion place and finished in 7th place, with 40 points, 16 behind champions Falkirk.
See main article: 1969–70 Scottish League Cup. The League Cup however, brought some cheer, with four wins and a draw from the six sectional games, Dumbarton qualified to meet Brechin City in a play off. A good home win after a tight draw at Brechin meant a quarter final against Ayr United, who were however to prove too strong.
See main article: article and 1969–70 Scottish Cup. In the Scottish Cup, Dumbarton had an easy time beating non-league Gala Fairydean in the second preliminary round, but it was a huge disappointment to lose in the first round proper to Division 2 strugglers Forfar Athletic at home.
Locally, in the Stirlingshire Cup, Dumbarton reached their first final for five years, before losing out to Falkirk.
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Source:[1]
Amongst those players joining and leaving the club were the following:
| Player | From | Date | |
|---|---|---|---|
| Allan McKay | Motherwell | 22 May 1969 | |
| Eddie Ferguson | Dunfermline Ath | 19 Jun 1969 | |
| Kenny Jenkins | Albion Rovers | 26 Jun 1969 | |
| John Jamieson | Albion Rovers | 25 Oct 1969 | |
| Colin McAdam | Clydebank Juv | 12 Mar 1970 | |
| Laurie Williams | Port Glasgow | 30 Mar 1970 |
Source:[2]