San Zeferino
| Name | San Zeferino |
| Type | Tanker |
| GRT | 6,430 tons |
| Country |  British |
| Built | 1914 |
| Builder | Palmers’ SB. & Iron Co., Ltd., Newcastle |
| Operator | Eagle Oil Transport Co., Ltd., London |
| History |
U-boat attacks on Tanker San Zeferino
| Date | U-boat | Loss type | Position | Location | Route | Cargo | Casualties | |
| 1 | 18 Sep 1915 | UC 6 (Matthias Graf von Schmettow) | Damaged | Mined 2 miles NNW of the South Goodwin LV | Puerto Mexico - Sheerness | oil fuel | 2 | |
| 2 | 26 Sep 1917 | UC 33 (Alfred Arnold) | Damaged | 51° 52'N, 6° 25'W | Avonmouth - Tampico | in ballast | 3 | |
Position of attack on San Zeferino
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