| Born | 29 Apr, 1916 | Cuxhaven |
| Died | 1 Mar, 1944 | North Atlantic |
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Ranks
Decorations |
U-boat Commands
| U-142 | 18 Mar, 1942 | - | 12 Sep, 1942 | No war patrols |
| U-603 | 13 Sep, 1942 | - | 2 May, 1943 | 2 patrols (65 days) |
| U-603 | 29 Jan, 1944 | - | 1 Mar, 1944 (+) | 1 patrol (26 days) |
Patrol info
| U-boat | Departure | Arrival | |||||
| 1. | U-603 | 5 Nov, 1942 | Kiel | 7 Nov, 1942 | Kristiansand | 3 days | |
| 2. | U-603 | 13 Nov, 1942 | Kristiansand | 17 Nov, 1942 | Bergen | 5 days | |
| 3. | U-603 | 22 Nov, 1942 | Bergen | 23 Nov, 1942 | Bergen | 2 days | |
| 4. | U-603 | 23 Nov, 1942 | Bergen | 9 Dec, 1942 | Brest | Patrol, | 17 days |
| 5. | U-603 | 7 Feb, 1943 | Brest | 26 Mar, 1943 | Brest | Patrol, | 48 days |
| 6. | U-603 | 5 Feb, 1944 | Brest | 1 Mar, 1944 | Sunk | Patrol, | 26 days |
| 3 patrols, 91 days at sea | |||||||
Ships hit by Hans-Joachim Bertelsmann
| Date | Boat | Name of ship | Tons | Nat. | Convoy | Fate * | |
| 21 Feb, 1943 | U-603 | Stigstad | 5.964 |  | nw | ON-166 | |
| 23 Feb, 1943 | U-603 | Glittre | 6.409 | | nw | ON-166 | |
| 16 Mar, 1943 | U-603 | Elin K. | 5.214 | | nw | HX-229 | |
| 17.587 | |||||||
* Unless otherwise noted the ships listed here were sunk. | |||||||
Decorations and ranks information is in many cases not complete. If you can help on any of those missing that would be great.