| Club: | Dumbarton |
| Season: | 1964–1965 |
| Manager: | Jackie Fearn / Willie Toner |
| Stadium: | Boghead Park, Dumbarton |
| League: | Scottish League Division 2 |
| League Result: | 14th |
| Cup1: | Scottish Cup |
| Cup1 Result: | First Round |
| Cup2: | Scottish League Cup |
| Cup2 Result: | Prelims |
| League Topscorer: | Drew Nelson (17) |
| Season Topscorer: | Drew Nelson (17) |
| Prevseason: | 1963–64 |
| Nextseason: | 1965–66 |
The 1964–65 season was the 81st 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: 1964–65 Scottish Football League. Following a poor start to the league season, which saw only one win taken from the first five games, manager Jackie Fearn resigned, and by the time Willie Toner took over, the season was effectively over, as only another win and a draw had been taken from the subsequent seven matches. An unbeaten run of 8 games in November/December brought some cheer, but in the end only 14th place could be achieved, with 32 points, 27 behind champions Stirling Albion.
See main article: 1964–65 Scottish League Cup. In the League Cup, Dumbarton were on the losing side only once in their sectional ties, but too many draws meant that once again qualification for the knock out stages was not achieved.
See main article: article and 1964–65 Scottish Cup. In the Scottish Cup, Dumbarton fell to a first round defeat against Queen's Park, after a draw.
Locally however, Dumbarton were to regain the Stirlingshire Cup for the third time, with a fine aggregate win over Division 1 opponents Falkirk.
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Source:[1]
Amongst those players joining and leaving the club were the following:
| Player | From | Date | |
|---|---|---|---|
| Jimmy McGregor | Stirling Albion | 13 Jul 1964 | |
| Tommy Reynolds | Irvine Meadow | 14 Sep 1964 | |
| Drew Nelson | Ayr United | 2 Oct 1964 | |
| Bobby Johnstone | Airdrie | 6 Nov 1964 |
| Player | To | Date | |
|---|---|---|---|
| Don Bowie | Stirling Albion | 23 Jul 1964 | |
| Alan Black | Sunderland | 1 Aug 1964 | |
| John Lawlor | Falkirk | 1 Aug 1964 | |
| Jimmy McGregor | Freed | 30 Apr 1965 |
Source:[2]