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William S. Cowles | |
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| Birth name | William Sheffield Cowles |
| Born | August 1, 1846 Farmington, Connecticut |
| Died | May 1, 1923 (aged 76) Farmington, Connecticut |
| Place of burial | Riverside Cemetery, Farmington, Connecticut |
| Allegiance |  United States |
| Service |  United States Navy |
| Years of service | 1863–1908 |
| Rank | Rear Admiral |
| Battles / wars | Spanish–American War |
| Spouse(s) | |
| Children | W. Sheffield Cowles |
William Sheffield Cowles (August 1, 1846 – May 1, 1923) was a rear admiral in the United States Navy.