Sir Archibald Day | |
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| Born | 18 July 1899 |
| Died | 17 July 1970 (aged 70) Dover |
| Allegiance | United Kingdom |
| Service | Royal Navy |
| Years of service | 1914–1955 |
| Rank | Vice-admiral |
| Office | Hydrographer of the Navy |
| Term | 1950-1955 |
Vice-Admiral Sir Archibald Day, KBE, CB, DSO (18 July 1899 – 17 July 1970) was an officer in the Royal Navy and Hydrographer of the Navy from 1950-1955. He played an important part in planning the evacuation from Dunkirk in 1940, and wrote a history of the Hydrographic Service.