| U-8 | Type IIB |
| Feldpost Number | M 06 994 |
| Construction Yard | F.Krupp Germaniawerft AG, Kiel-Gaarden |
| Yard Number | 542 |
| Ordered | 20th Jul 1934 |
| Keel laid | 25th Mar 1935 |
| Launched | 16th Jul 1935 |
| Commissioned | 5th Aug 1935 |
| Baubelehrung | Marinelehr-und Reparaturwerkstatt, Kiel |
| Training, Flotillas and Duties |
| 08.35 - 12.39 | U-Schule Flottille, Neustadt Schulboot (training boat) Frontboot (operational)
|
| 01.40 - 05.40 | U-Abwehr Schule Schulboot (training boat)
|
| 04.40 - 06.40 | 1.U-Flottille, Kiel Schulboot (training boat) Frontboot (operational)
|
| 07.40 - 12.40 | 24.U-Flottille, Memel Ausbildungsboot (under training)
|
| 12.40 - 05.45 | 22.U-Flottille, Gotenhafen Schulboot (training boat)
|
| Commanders |
| 05.08.35 - 03.11.36 | OL ~ KL Harald Grosse see also: U-34 U-22 U-53 |
| 04.11.36 - 01.09.38 | OL Georg Peters see also: U-11 U-6 U-A |
| 02.09.38 - 29.10.38 | KL Otto Schuhart see also: U-25 U-29 |
| 30.10.38 - 05.09.39 | OL Georg Peters see also: U-11 U-6 U-A |
| 06.09.39 - 13.10.39 | KL Wolf-Harro Stiebler see also: U-17 U-21 U-61 U-461 |
| 14.10.39 - 30.11.39 | KL Heinrich Christian Wilhelm Lehmann-Willenbrock see also: U-5 U-96 U-256 |
| 01.12.39 - 04.05.40 | KL Georg-Heinz Michel see also: U-29 U-25 U-54 |
| 05.05.40 - 04.06.40 | KL Eitel-Friedrich Kentrat see also: U-74 U-196 |
| 05.06.40 - 09.06.40 | OL Heinz Stein see also: U-554 U-620 |
| 10.06.40 - 06.07.40 | OL Walter Kell see also: U-204 |
| 07.07.40 - 28.07.40 | OL Hans-Jürgen Zetzsche see also: U-20 U-4 U-560 U-591 |
| 29.07.40 - 12.09.40 | KL Eitel-Friedrich Kentrat see also: U-74 U-196 |
| 13.09.40 - 17.12.40 | OL Walter Kell see also: U-204 |
| 18.12.40 - 25.04.41 | KL Heinrich Heinsoh see also: U-573 U-438 |
| 29.04.41 - 22.05.41 | KL Ulrich Borcherdt see also: U-587 |
| 23.05.41 - 31.07.41 | OL Rolf Steinhaus see also: U-802 |
| 01.08.41 - 16.05.42 | OL Horst Deckert see also: U-73 |
| 17.05.42 - 15.03.43 | OL Rudolf Hoffmann see also: U-845 |
| 16.03.43 - 12.05.44 | LT ~ OL Alfred Werner see also: U-921 |