| Club: | Rochdale |
| Season: | 1939–40 |
| Manager: | Ted Goodier |
| Stadium: | Spotland Stadium |
| League: | Regional League - NW Division |
| League Result: | 9th |
| Cup1: | League War Cup |
| Cup1 Result: | 3rd Round |
| League Topscorer: | Arthur Richardson |
| Season Topscorer: | Arthur Richardson |
| Prevseason: | 1938–39 |
| Nextseason: | 1940–41 |
The 1939–40 season saw Rochdale begin to compete for their 19th season in the Football League Third Division North, however with the outbreak of World War 2, the league was abandoned, and a wartime league was formed. The F.A. Cup was also cancelled and replaced with the League War Cup.
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