| Tumbling Bay | |
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| General information | |
| Type | Bathing Spot |
| Location | Oxford |
| Coordinates | 51°45′20″N 1°16′27″W / 51.75544°N 1.2743°W |
| Grid position | SP 502 065 |
| Opened | 1853 |
| Renovated | 1866 |
| Closed | 1990 |
Tumbling Bay, also known as Tum, is an outdoors bathing area in Oxford, England. Fed by the River Thames, the bathing spot opened in 1853 and closed formally in 1990. Subsequently, it has been known as a wild swimming location.