English
| U-21 | Type IIB |
| Feldpost Number | M 08 360 |
| Construction Yard | F.Krupp Germaniawerft AG, Kiel-Gaarden |
| Yard Number | 551 |
| Ordered | 2nd Feb 1935 |
| Keel laid | 4th Mar 1936 |
| Launched | 31st Jul 1936 |
| Commissioned | 3rd Aug 1936 |
| Baubelehrung | Marinelehr-und Reparaturwerkstatt, Kiel |
| Training, Flotillas and Duties | |
| 08.36 – 11.39 | U-Flottille Weddigen, Kiel Frontboot (operational) |
| 01.40 – 06.40 | 1.U-Flottille, Kiel Frontboot (operational) |
| 07.40 – 08.44 | 21.U-Flottille, Pillau Schulboot (training boat) |
| 08.44 | Decommissioned |
| Commanders | |
| 03.08.36 – 09.36 | OL Fritz Hermann Günter Frauenheim see also: U-101 |
| 09.36 – 31.03.37 | KL Werner Lott see also: U-32 U-35 |
| 1937 | KL Wilhelm Ambrosius see also: U-28 U-43 |
| ?? – 03.10.1937 | OL Kurt Freiwald see also: U-7 U-33 U-181 |
| 37 – 37 | FK Erwin Sachs |
| 01.10.37 – 30.12.39 | OL ~ KL Fritz Hermann Günter Frauenheim see also: U-101 |
| 06.01.40 – 28.08.40 | OL ~ KL Wolf-Harro Stiebler see also: U-8 U-17 U-61 U-461 |
| 01.08.40 – 20.12.40 | OL Hans Otto Joachim Heinrich Heidtmann see also: U-2 U-14 U-559 |
| 21.12.40 – 18.05.41 | KL Ernst-Bernhard Lohse see also: U-585 |
| 19.05.41 – 03.01.42 | OL Karl-Heinz Herbschleb see also: U-354 |
| 04.01.42 – 24.09.42 | OL Hans-Heinrich Döhler see also: U-606 |
| 25.09.42 – 28.01.43 | LT Hans-Ferdinand Geisler see also: U-152 U-3006 |
| 29.01.43 – 11.05.44 | LT ~ OL Rudolf Kugelberg |
| 12.05.44 – 05.08.44 | OL Wolfgang Schwarzkopf see also: U-2 U-704 |
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