| Navy | The Royal Navy |
| Type | Submarine |
| Class | U |
| Pennant | N 56 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | 4 Sep 1939 |
| Laid down | 9 Dec 1939 |
| Launched | 1 Oct 1940 |
| Commissioned | 22 Feb 1941 |
| Lost | 20 Jul 1941 |
| Loss position | |
| History | HMS Union (Lt. Robert Malcolm Galloway, RN) sailed from Malta at 0100 hours on 14 July 1941. On 20 July 1941 she was sunk during an attack on a convoy by the Italian torpedo boat Circe 25 nautical miles south-west of Pantelleria island in the Strait of Sicily. HMS Union was reported overdue on 22 July 1941. |
Commands listed for HMS Union (N 56)
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| Commander | From | To | |
| 1 | Lt. Robert Malcolm Galloway, RN | 3 Jan 1941 | 20 Jul 1941 (+) |
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Noteable events involving Union include:
22 Jun 1941
HMS Union (Lt. R.M. Galloway, RN) torpedoes and sinks the Italian merchant Pietro Querini (1004 GRT, built 1906) about 30 nautical miles west-south-west of Lampedusa Island in position 35º17'N, 12º00'E.
At 1400 hours (time zone -2) HMS Union sighted smoke bearing 013 degrees. Lt. Galloway closes. At 1425 hours a convoy of one trawler, one schooner and one merchant of about 2800 tons was spotted. Union closes to make a torpedo attack on the merchant vessel.
At 1507 hours Union fired three torpedoes from 1200 yards. The second torpedo was a hit. At 1525 hours the first depth charge was dropped. At 1543 hours Lt. Galloway returned to periscope depth and observed the trawler and schooner coming directly towards Union so he went to 70 feet. Depth charges were dropped but these did no damage. While at periscope depth the merchant was observed to be sinking. At 1625 hours Union returned to periscope depth but found nothing in sight. (see map)