The 1933–34 season was the 25th in the history of the Isthmian League, an English football competition.
Kingstonian were champions, winning their first Isthmian League title.
| Competition: | Isthmian League |
| Season: | 1933–34 |
| Winners: | Kingstonian |
| Matches: | 182 |
| Total Goals: | 729 |
| Prevseason: | 1932–33 |
| Nextseason: | 1934–35 |