This is the full listing of all ships hit during May 1916. You can click on any of the links for further information on either ship, U-boat, commander or convoy.
| Date | U-boat | Commander | | Name of ship | Tons | Nat. |
| |
| 1 May 1916 | U 20 | Walther Schwieger | | Bernadette | 486 |  | fr |
| 1 May 1916 | UB 27 | Victor Dieckmann | | Rio Branco | 2,258 |  | bz |
| 1 May 1916 | UC 10 | Alfred Nitzsche | | Hendonhall | 3,994 |  | br |
| 2 May 1916 | U 20 | Walther Schwieger | | Ruabon | 2,004 |  | br |
| 2 May 1916 | U 45 | Erich Sittenfeld | | Le Pilier | 2,427 |  | fr |
| 2 May 1916 | U 45 | Erich Sittenfeld | | Maud | 120 |  | br |
| 2 May 1916 | UB 27 | Victor Dieckmann | | Mars | 581 |  | nw |
| 2 May 1916 | UB 27 | Victor Dieckmann | | Memento | 654 |  | nw |
| 2 May 1916 | UB 27 | Victor Dieckmann | | Superb | 770 |  | nw |
| 2 May 1916 | UC 1 | Kurt Ramien | | Fridland (d.) | 4,960 |  | sw |
| 2 May 1916 | UC 10 | Alfred Nitzsche | | Rochester City | 1,239 |  | br |
| 3 May 1916 | U 20 | Walther Schwieger | | Marie Molinos | 1,946 |  | fr |
| 4 May 1916 | U 73 | Gustav Sieß | | Crownsin | 137 |  | br |
| 5 May 1916 | UB 21 | Ernst Hashagen | | Harald | 275 |  | sw |
| 6 May 1916 | U 20 | Walther Schwieger | | Galgate | 2,356 |  | br |
| 8 May 1916 | U 20 | Walther Schwieger | | Cymric | 13,370 |  | br |
| 10 May 1916 | UC 7 | Georg Haag | | Dolcoath | 1,706 |  | br |
| 15 May 1916 | U 34 | Claus Rücker | | Mira | 3,050 |  | fr |
| 16 May 1916 | U 38 | Max Valentiner | | Clifford | 487 |  | br |
| 16 May 1916 | UC 6 | Matthias Graf von Schmettow | | Batavier V | 1,569 |  | nl |
| 17 May 1916 | k.u.k. U15 | Friedrich Fähndrich | | Stura | 2,237 |  | it |
| 17 May 1916 | UB 18 | Otto Steinbrinck | | Research | 44 |  | br |
| 17 May 1916 | UB 29 | Herbert Pustkuchen | | Boy Percy | 46 |  | br |
| 17 May 1916 | UB 29 | Herbert Pustkuchen | | Boy Sam | 46 |  | br |
| 17 May 1916 | UB 29 | Herbert Pustkuchen | | Wanderer | 47 |  | br |
| 18 May 1916 | U 34 | Claus Rücker | | Adamantios Korais | 2,947 |  | gr |
| 18 May 1916 | U 34 | Claus Rücker | | San Andrea | 225 |  | it |
| 18 May 1916 | UB 19 | Walter Gustav Becker | | Osprey | 18 |  | br |
| 20 May 1916 | U 34 | Claus Rücker | | Erminia | 1,544 |  | it |
| 20 May 1916 | U 34 | Claus Rücker | | Fabricotti F. | 150 |  | it |
| 20 May 1916 | U 34 | Claus Rücker | | Languedoc | 1,612 |  | fr |
| 20 May 1916 | U 39 | Walter Forstmann | | Redentore | 228 |  | it |
| 20 May 1916 | U 39 | Walter Forstmann | | Valsesia | 248 |  | it |
| 21 May 1916 | U 34 | Claus Rücker | | Myosotis | 356 |  | fr |
| 21 May 1916 | U 34 | Claus Rücker | | Tjømø | 1,453 |  | nw |
| 21 May 1916 | U 39 | Walter Forstmann | | Birmania | 2,384 |  | it |
| 21 May 1916 | U 39 | Walter Forstmann | | Rosalia Madre | 251 |  | it |
| 22 May 1916 | U 34 | Claus Rücker | | Australia | 1,586 |  | it |
| 22 May 1916 | U 34 | Claus Rücker | | Genista | 1,856 |  | it |
| 22 May 1916 | U 34 | Claus Rücker | | Istros | 1,891 |  | gr |
| 22 May 1916 | U 34 | Claus Rücker | | Orealla | 1,876 |  | it |
| 22 May 1916 | U 34 | Claus Rücker | | Roberto G | 587 |  | it |
| 22 May 1916 | UC 10 | Alfred Nitzsche | | Rhenass | 285 |  | br |
| 23 May 1916 | U 34 | Claus Rücker | | Cornigliano | 2,862 |  | it |
| 23 May 1916 | U 34 | Claus Rücker | | Regina | 593 |  | ru |
| 23 May 1916 | U 39 | Walter Forstmann | | Hercules | 2,704 |  | it |
| 23 May 1916 | U 39 | Walter Forstmann | | Maria Porto Di Salvezza | 39 |  | it |
| 23 May 1916 | U 39 | Walter Forstmann | | Teresa Accame (d.) | 4,742 |  | it |
| 23 May 1916 | U 39 | Walter Forstmann | | Washington | 2,819 |  | it |
| 24 May 1916 | U 39 | Walter Forstmann | | Aurrera | 2,845 |  | sp |
| 25 May 1916 | U 39 | Walter Forstmann | | Fratelli Bandiera | 3,506 |  | it |
| 25 May 1916 | U 39 | Walter Forstmann | | Rita | 200 |  | it |
| 25 May 1916 | UC 6 | Otto Ehrentraut | | Volharding | 1,000 |  | be |
| 26 May 1916 | | | | Evaristus | 130 |  | be |
| 26 May 1916 | UC 1 | Kurt Ramien | | El Argentino | 6,809 |  | br |
| 26 May 1916 | UC 3 | Günther Kreysern | | Denewood | 1,221 |  | br |
| 27 May 1916 | U 39 | Walter Forstmann | | Mar Terso | 3,778 |  | it |
| 27 May 1916 | U 39 | Walter Forstmann | | Trunkby | 2,635 |  | br |
| 27 May 1916 | UC 10 | Alfred Nitzsche | | Lincairn | 3,638 |  | br |
| 28 May 1916 | U 39 | Walter Forstmann | | Lady Ninian | 4,297 |  | br |
| 29 May 1916 | U 39 | Walter Forstmann | | Baron Vernon | 1,779 |  | br |
| 29 May 1916 | U 39 | Walter Forstmann | | Elmgrove | 3,018 |  | br |
| 29 May 1916 | U 39 | Walter Forstmann | | Southgarth | 2,414 |  | br |
| 30 May 1916 | U 34 | Claus Rücker | | Julia Park | 2,900 |  | br |
| 30 May 1916 | U 39 | Walter Forstmann | | Baron Tweedmouth | 5,007 |  | br |
| 30 May 1916 | U 39 | Walter Forstmann | | Dalegarth | 2,265 |  | br |
| 30 May 1916 | U 39 | Walter Forstmann | | Hermesberg | 2,884 |  | it |
| 30 May 1916 | U 39 | Walter Forstmann | | Rauma | 3,047 |  | nw |
|
| 133,438 | | | 66 ships sunk (123,736 tons) and 2 ships damaged (9,702 tons). Legend (d.) means the ship was damaged.
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This map shows where Allied ships were hit during May 1916.

In some cases the exact positions of losses are not known, those are not shown.