Ships hit by U-20
See the profile page for U-20
| Date | U-boat | Commander | Name of ship | Tons | Nat. | Convoy | ||
| 29 Nov, 1939 | U-20 | Karl-Heinz Moehle |  | Ionian [Mine] | 3.114 |  | br | FN-43 |
| 9 Dec, 1939 | U-20 | Karl-Heinz Moehle | Magnus | 1.339 |  | da | ||
| 10 Dec, 1939 | U-20 | Karl-Heinz Moehle | Føina | 1.674 |  | nw | ||
| 10 Dec, 1939 | U-20 | Karl-Heinz Moehle | | Willowpool [Mine] | 4.815 | | br | HG-9 |
| 13 Jan, 1940 | U-20 | Karl-Heinz Moehle | Sylvia | 1.524 |  | sw | ||
| 27 Jan, 1940 | U-20 | Harro von Klot-Heydenfeldt | England | 2.319 | | da | ||
| 27 Jan, 1940 | U-20 | Harro von Klot-Heydenfeldt | | Faro (t.) | 844 | | nw | |
| 27 Jan, 1940 | U-20 | Harro von Klot-Heydenfeldt | | Fredensborg | 2.094 | | da | |
| 27 Jan, 1940 | U-20 | Harro von Klot-Heydenfeldt | Hosanger | 1.591 | | nw | ||
| 29 Feb, 1940 | U-20 | Harro von Klot-Heydenfeldt | Maria Rosa | 4.211 |  | it | ||
| 1 Mar, 1940 | U-20 | Harro von Klot-Heydenfeldt | Mirella | 5.340 | | it | ||
| 29 Nov, 1943 | U-20 | Karl Grafen | Peredovik (d.) | 1.846 |  | sj | ||
| 16 Jan, 1944 | U-20 | Karl Grafen | Vaijan Kutur´e (t.) | 7.602 | | sj | ||
| 7 Apr, 1944 | U-20 | Karl Grafen | Rion [Mine] | 187 | | sj | ||
| 19 Jun, 1944 | U-20 | Karl Grafen | Pestel´ | 1.850 | | sj | ||
| 24 Jun, 1944 | U-20 | Karl Grafen | DB-26 | 9 | | sj | ||
| 40.359 | ||||||||
| 15 ships sunk (38.513 tons) and 1 ship damaged (1.846 tons).
[Mine] indicates the vessel was hit by a mine laid by said U-boat.
| ||||||||